Read and write numbers up to crores (8-digit numbers)
Understand the Indian Number System with proper comma placement
Understand the International Number System with proper comma placement
Compare the Indian and International systems side by side
Write numbers in expanded form (up to 8 digits)
Compare and order large numbers using >, <, and =
Find the predecessor and successor of large numbers
Solve word problems involving large numbers in real-life Indian contexts
Introduction — Why Do We Need Large Numbers?
In Class 4, you learned about numbers up to 9,99,999 (nine lakh ninety-nine thousand nine hundred and ninety-nine). But think about this: India's population is more than 140 crore! The distance from the Earth to the Moon is about 3,84,400 kilometres. ISRO's Chandrayaan-3 mission cost about 615 crore rupees. To talk about such large quantities, we need numbers that go beyond lakhs — we need crores!
In Class 5, we will learn to read, write, and work with numbers up to 9,99,99,999 (nine crore ninety-nine lakh ninety-nine thousand nine hundred and ninety-nine). We will also learn two different ways to name large numbers — the Indian Number System and the International Number System.
The Indian Number System — Place Value Chart
In the Indian Number System, we group digits starting from the right. The first group (Ones) has 3 digits, and every group after that has 2 digits. The place values are:
Crores (Cr)
Ten Lakhs (TL)
Lakhs (L)
Ten Thousands (TTh)
Thousands (Th)
Hundreds (H)
Tens (T)
Ones (O)
10,00,00,000
10,00,000
1,00,000
10,000
1,000
100
10
1
Crores Period
Lakhs Period
Thousands Period
Ones
Image needed: A colourful Indian Number System place value chart showing all 8 places from Ones to Crores. Each period (Ones, Thousands, Lakhs, Crores) highlighted in different colours. Arrows showing groups of digits. The number 5,32,48,671 placed in the chart as an example. Style: Clean flat illustration, bright colours, child-friendly, labelled clearly Size: 800×450px
Understanding the Periods
In the Indian system, digits are grouped into periods:
Ones Period: Ones (O), Tens (T), Hundreds (H) — the first 3 digits from the right
Thousands Period: Thousands (Th), Ten Thousands (TTh) — the next 2 digits
Lakhs Period: Lakhs (L), Ten Lakhs (TL) — the next 2 digits
Crores Period: Crores (Cr) — the next digit(s)
Example: Let us place the number 4,56,78,923 in the place value chart.
Cr
TL
L
TTh
Th
H
T
O
4
5
6
7
8
9
2
3
We read this as: Four crore fifty-six lakh seventy-eight thousand nine hundred and twenty-three.
Comma Placement — Indian System
Commas help us read large numbers easily. In the Indian system, we place commas like this:
Rules for Placing Commas (Indian System)
The first comma comes after 3 digits from the right (separates Hundreds from Thousands).
After that, place a comma after every 2 digits.
Examples:
Number (without commas)
With commas (Indian)
Number Name
2345678
23,45,678
Twenty-three lakh forty-five thousand six hundred and seventy-eight
50000000
5,00,00,000
Five crore
91234567
9,12,34,567
Nine crore twelve lakh thirty-four thousand five hundred and sixty-seven
7890123
78,90,123
Seventy-eight lakh ninety thousand one hundred and twenty-three
10050030
1,00,50,030
One crore fifty thousand and thirty
Think About It: Why do we use commas differently in India compared to other countries? It is because our number names are different! We say "lakh" (1,00,000) while other countries say "hundred thousand" (100,000). The comma placement matches our way of reading numbers.
The International Number System
The International Number System is used in most countries around the world (USA, UK, Australia, etc.). In this system, digits are grouped in sets of 3 from the right. The place values are:
Ten Millions (TM)
Millions (M)
Hundred Thousands (HTh)
Ten Thousands (TTh)
Thousands (Th)
Hundreds (H)
Tens (T)
Ones (O)
10,000,000
1,000,000
100,000
10,000
1,000
100
10
1
Millions Period
Thousands Period
Ones Period
Image needed: A colourful International Number System place value chart showing all 8 places from Ones to Ten Millions. Groups of 3 digits highlighted in different colours. The number 53,248,671 placed in the chart as an example. Style: Clean flat illustration, bright colours, child-friendly, labelled clearly Size: 800×450px
Understanding the Periods (International)
Ones Period: Ones (O), Tens (T), Hundreds (H) — first 3 digits from right
Thousands Period: Thousands (Th), Ten Thousands (TTh), Hundred Thousands (HTh) — next 3 digits
Millions Period: Millions (M), Ten Millions (TM) — next 2 digits (for 8-digit numbers)
Example: The number 45,678,923 in the International system.
TM
M
HTh
TTh
Th
H
T
O
4
5
6
7
8
9
2
3
We read this as: Forty-five million six hundred seventy-eight thousand nine hundred and twenty-three.
Comma Placement — International System
Rules for Placing Commas (International System)
Place a comma after every 3 digits from the right.
This means commas come after Hundreds, and then after every group of three digits.
Examples:
Number (without commas)
With commas (International)
Number Name
2345678
2,345,678
Two million three hundred forty-five thousand six hundred seventy-eight
50000000
50,000,000
Fifty million
91234567
91,234,567
Ninety-one million two hundred thirty-four thousand five hundred sixty-seven
7890123
7,890,123
Seven million eight hundred ninety thousand one hundred twenty-three
10050030
10,050,030
Ten million fifty thousand and thirty
Comparison: Indian vs International Number System
Both systems use the same digits and the same value — only the way we name and group numbers is different. Here is a side-by-side comparison:
Number
Indian System (with commas)
Indian Name
International System (with commas)
International Name
100000
1,00,000
One Lakh
100,000
One Hundred Thousand
1000000
10,00,000
Ten Lakh
1,000,000
One Million
10000000
1,00,00,000
One Crore
10,000,000
Ten Million
50000000
5,00,00,000
Five Crore
50,000,000
Fifty Million
99999999
9,99,99,999
Nine Crore Ninety-Nine Lakh Ninety-Nine Thousand Nine Hundred Ninety-Nine
99,999,999
Ninety-Nine Million Nine Hundred Ninety-Nine Thousand Nine Hundred Ninety-Nine
Image needed: A visual comparison showing the same number (e.g., 3,25,47,000 vs 32,547,000) written in both Indian and International format side by side. Use two columns with colour-coded grouping to show how the same digits are grouped differently. Style: Infographic style, split layout, colourful with arrows showing grouping Size: 750×400px
Key Relationships to Remember
1 Lakh = 100 Thousand (1,00,000 = 100,000)
10 Lakhs = 1 Million (10,00,000 = 1,000,000)
1 Crore = 10 Million (1,00,00,000 = 10,000,000)
10 Crores = 100 Million (10,00,00,000 = 100,000,000)
Reading Large Numbers
When reading large numbers, commas act as helpful "pause points." We read the number period by period, from left to right.
Reading in the Indian System
Example 1: Read 3,45,67,890
Break it into periods: 3 (crore) | 45 (lakh) | 67 (thousand) | 890 (ones)
Read: Three crore forty-five lakh sixty-seven thousand eight hundred and ninety
Example 2: Read 7,08,00,501
Break it into periods: 7 (crore) | 08 (lakh) | 00 (thousand) | 501 (ones)
Read: Seven crore eight lakh five hundred and one
(Note: We skip "zero thousand" — we don't read zeros in the middle unless they have a value.)
Example 3: Read 6,00,40,020
Read: Six crore forty thousand and twenty
Reading in the International System
Example 4: Read 34,567,890
Break it into periods: 34 (million) | 567 (thousand) | 890 (ones)
Read: Thirty-four million five hundred sixty-seven thousand eight hundred ninety
Example 5: Read 70,800,501
Read: Seventy million eight hundred thousand five hundred one
Expanded Form of Large Numbers
The expanded form shows the value of each digit based on its place value. We multiply each digit by its place value and write them all added together.
When comparing large numbers, follow these rules in order:
Rules for Comparing Numbers
Rule 1: The number with more digits is always greater.
Example: 1,00,00,000 (8 digits) > 99,99,999 (7 digits)
Rule 2: If both numbers have the same number of digits, compare digit by digit from the left.
Start from the leftmost digit. The number with a larger digit at the first differing position is greater.
Example 1: Compare 5,43,21,678 and 5,43,25,678
Both have 8 digits. Compare from left:
5 = 5 ✓ | 4 = 4 ✓ | 3 = 3 ✓ | 2 = 2 ✓ | 1 < 5
So, 5,43,21,678 < 5,43,25,678
Example 2: Compare 7,89,45,123 and 7,89,45,123
All digits are exactly the same.
So, 7,89,45,123 = 7,89,45,123
Example 3: Arrange in ascending order: 3,45,67,890 ; 3,45,68,000 ; 3,44,99,999
All are 8-digit numbers. Compare from left:
- All start with 3,4...
- Third digit: 5, 5, 4 → 3,44,99,999 is smallest
- Between the other two: 3,45,67,890 vs 3,45,68,000 → 7 < 8 Ascending order: 3,44,99,999 < 3,45,67,890 < 3,45,68,000
Forming the Greatest and Smallest Numbers
Example 4: Using digits 7, 0, 3, 5, 2, 9, 1, 8 (each used once), form: Greatest 8-digit number: Arrange digits in descending order → 9,87,53,210 Smallest 8-digit number: Arrange digits in ascending order (but 0 cannot be first!) → 1,02,35,789
Predecessor and Successor
The predecessor of a number is 1 less than that number (the number that comes just before it). The successor of a number is 1 more than that number (the number that comes just after it).
Remember
Predecessor = Number − 1
Successor = Number + 1
Examples:
Number
Predecessor (−1)
Successor (+1)
5,00,00,000
4,99,99,999
5,00,00,001
1,00,00,000
99,99,999
1,00,00,001
9,99,99,999
9,99,99,998
10,00,00,000
3,50,00,000
3,49,99,999
3,50,00,001
7,00,00,001
7,00,00,000
7,00,00,002
Think About It: Notice how finding the predecessor of 1,00,00,000 gives us a 7-digit number (99,99,999). Similarly, the successor of 9,99,99,999 gives us a 9-digit number (10,00,00,000)! This is called "crossing a digit boundary."
Real-Life Examples of Large Numbers
Large numbers are everywhere around us! Let us look at some real-life examples from India:
Fact
Number (Indian System)
Number (International System)
Population of India (approx.)
1,40,00,00,000 (140 crore)
1,400,000,000 (1.4 billion)
Population of Mumbai
2,10,00,000 (2 crore 10 lakh)
21,000,000 (21 million)
Cost of Chandrayaan-3 (ISRO)
₹6,15,00,00,000 (615 crore)
₹6,150,000,000
Distance: Earth to Moon
3,84,400 km
384,400 km
Distance: Earth to Sun
15,00,00,000 km (15 crore)
150,000,000 km (150 million)
Indian Railways passengers per day
2,30,00,000 (2 crore 30 lakh)
23,000,000 (23 million)
Highest score in IPL history
287 runs (RCB vs PWI, 2013)
287 runs
Image needed: An infographic showing real-life large numbers in India — India's population (stick figures), ISRO rocket with budget label, train with passenger count, Moon with distance. All numbers shown in Indian system with commas. Style: Colourful infographic, child-friendly icons, clean layout Size: 800×500px
Let's Practice Reading:
Arjun read in the newspaper that Indian Railways earned ₹2,40,000 crore in the last year. His teacher asked him to write this number.
₹2,40,000 crore = ₹2,40,000 × 1,00,00,000 = ₹24,00,00,00,00,000
(This is beyond crores — it is in the "lakh crore" range! We will learn these in higher classes.)
Key Words
Term
Meaning
Place Value
The value of a digit based on its position in the number
Face Value
The digit itself, regardless of its position
Period
A group of digits separated by commas (Ones, Thousands, Lakhs, Crores)
Lakh
1,00,000 (one hundred thousand)
Crore
1,00,00,000 (ten million)
Million
1,000,000 (ten lakh)
Expanded Form
A number written as the sum of the values of each digit
Standard Form
The normal way of writing a number (e.g., 4,56,78,923)
Predecessor
The number that comes just before (number − 1)
Successor
The number that comes just after (number + 1)
Ascending Order
Arranging numbers from smallest to largest
Descending Order
Arranging numbers from largest to smallest
Key Points to Remember
In the Indian system: first comma after 3 digits from right, then after every 2 digits.
In the International system: comma after every 3 digits from the right.
1 Lakh = 100 Thousand | 10 Lakhs = 1 Million | 1 Crore = 10 Million
The largest 7-digit number is 99,99,999 (Ninety-nine lakh ninety-nine thousand nine hundred ninety-nine).
The smallest 8-digit number is 1,00,00,000 (One crore).
The largest 8-digit number is 9,99,99,999 (Nine crore ninety-nine lakh ninety-nine thousand nine hundred ninety-nine).
When comparing numbers: more digits = greater number. Same digits = compare from left.
Place value of a digit = Face value × Value of its position.
The value of the number does NOT change between Indian and International systems — only the way we read and write it changes.
Finished learning? Now test what you know!
🎯 Quick Quiz — Test Yourself!
Answer these questions right here. You get instant feedback — no paper needed!
Score: 0 / 8
1. How many zeros are there in one crore?
1 crore = 1,00,00,000 — that is 7 zeros.
2. In the Indian system, how is 4530000 written with commas?
Indian system groups as 45,30,000 (forty-five lakh thirty thousand).
3. What is the place value of 7 in 3,72,45,689?
The 7 is in the ten-lakhs place, so its place value is 70,00,000.
4. Which number is the largest?
9,99,99,999 (nearly 10 crore) is the largest — it is an 8-digit number close to a crore times ten.
5. Write "one crore" in figures (digits only):
One crore = 1,00,00,000 = 10000000.
6. 10 hundred-thousands make one ______ (in the Indian system).
1 lakh = 1,00,000. Ten lakhs = 10,00,000 (which is one million).
7. Write the successor of 5,32,48,670 (digits only):
Successor = number + 1 = 5,32,48,671.
8. Put <, > or = : 45,67,890 ____ 4,56,78,900
45,67,890 is about 45 lakh; 4,56,78,900 is about 4.5 crore. So 45,67,890 < 4,56,78,900.
Practice Questions
A. Write the number names in the Indian system:
1. 3,45,67,890
2. 7,08,09,050
3. 1,00,00,001
4. 9,87,65,432
5. 5,05,05,505
B. Write the number names in the International system:
1. 34,567,890
2. 70,809,050
3. 10,000,001
C. Write the following in figures:
1. Six crore thirty-two lakh forty-five thousand seven hundred and eight =
2. Nine crore nine lakh nine thousand and nine =
3. Forty-five million three hundred twenty-one thousand six hundred =
4. Two crore five lakh sixty =
D. Write in expanded form:
1. 6,54,32,100
2. 2,09,08,007
3. 8,00,50,060
4. 4,44,44,444
E. Place commas according to the Indian system:
1. 45678901 =
2. 90030070 =
3. 12345678 =
4. 80000001 =
F. Place commas according to the International system:
1. 45678901 =
2. 90030070 =
3. 12345678 =
4. 80000001 =
G. Compare using >, < or =
1. 4,56,78,900 4,56,79,000
2. 9,99,99,999 1,00,00,000
3. 3,25,47,000 32,547,000
4. 7,00,00,001 6,99,99,999
5. 5,55,55,555 5,55,55,555
H. Write the predecessor and successor:
Number
Predecessor
Successor
4,00,00,000
1,00,00,000
6,50,00,000
9,99,99,999
2,34,56,789
I. Choose the correct answer (MCQ):
1. How many zeros are there in 1 crore?
a) 5b) 6c) 7d) 8
2. 10 lakhs = __________ (International system)
a) 1 Billionb) 1 Millionc) 10 Milliond) 100 Thousand
3. The place value of 6 in 3,64,21,578 is:
a) 6b) 60,000c) 6,00,000d) 60,00,000
4. The smallest 8-digit number is:
a) 99,99,999b) 1,00,00,000c) 10,00,000d) 1,00,00,001
J. Word Problems:
1. The population of Delhi is 1,90,00,000 and the population of Chennai is 87,00,000. Which city has more population? By how much?
2. ISRO spent ₹3,86,00,00,000 on a satellite launch. Write this amount in the International system with commas.
3. Ravi's father said that Indian Railways carries 2,30,00,000 passengers every day. Write this number in words (Indian system) and also in the International system.
4. Priya wrote the number "Five crore twenty lakh" as 5,20,000. Is she correct? If not, write the correct number.
Visualising Large Numbers on a Number Line
A number line helps us understand the position and order of numbers. Here is a number line showing crore-level numbers:
Image needed: A number line from 1,00,00,000 to 10,00,00,000 (1 crore to 10 crore), with markers at each crore (1 Cr, 2 Cr, 3 Cr... 10 Cr). Some numbers marked in between (e.g., 3,50,00,000 and 7,25,00,000) with arrows pointing to their approximate positions. Style: Clean horizontal number line, colourful markers, labelled, child-friendly Size: 800×250px
Activity — Large Number Hunt!
Go on a number hunt in your daily life! Find large numbers from newspapers, magazines, news websites, or ask your parents. Collect at least 5 large numbers and fill in this table:
Where I Found It
The Number
Indian System (with commas)
Number Name
Example: Newspaper
Population of UP
24,00,00,000
Twenty-four crore
Bonus Challenge: Convert any 3 of your numbers into the International system and write their names in that system too!
Want to review the lesson again?
Mathematics
Large Numbers — Lakhs and Crores
Class 5 | CBSE / NCERT / ICSE
Name: Class: Date:
Learning Objectives
Read and write numbers up to crores (8-digit numbers)
Understand the Indian and International Number Systems
Write numbers in expanded form and compare large numbers
Find predecessor and successor of large numbers
Solve word problems involving large numbers
Introduction — Why Large Numbers?
In Class 4, you learned numbers up to 9,99,999. Now in Class 5, we go up to 9,99,99,999 (Nine crore). India's population is over 140 crore. ISRO's Chandrayaan-3 cost ₹615 crore. To express such large quantities, we need crores!
We will learn two systems: the Indian Number System (used in India) and the International Number System (used worldwide).
Indian Number System — Place Value Chart
Crores (Cr)
Ten Lakhs (TL)
Lakhs (L)
Ten Thou. (TTh)
Thou. (Th)
Hundreds (H)
Tens (T)
Ones (O)
1,00,00,000
10,00,000
1,00,000
10,000
1,000
100
10
1
[Image: Indian Number System place value chart — Ones to Crores, colour-coded periods]
Rule: First comma after 3 digits from right, then after every 2 digits.
Without commas
With commas
Number Name
2345678
23,45,678
Twenty-three lakh forty-five thousand six hundred seventy-eight
50000000
5,00,00,000
Five crore
91234567
9,12,34,567
Nine crore twelve lakh thirty-four thousand five hundred sixty-seven
10050030
1,00,50,030
One crore fifty thousand and thirty
International Number System — Place Value Chart
Ten Mill. (TM)
Millions (M)
Hund. Thou. (HTh)
Ten Thou. (TTh)
Thou. (Th)
Hundreds (H)
Tens (T)
Ones (O)
10,000,000
1,000,000
100,000
10,000
1,000
100
10
1
[Image: International Number System place value chart — Ones to Ten Millions, groups of 3]
Periods in International System: Ones (O, T, H) → Thousands (Th, TTh, HTh) → Millions (M, TM)
Comma Rule (International): Place a comma after every 3 digits from the right.
Without commas
With commas
Number Name
2345678
2,345,678
Two million three hundred forty-five thousand six hundred seventy-eight
50000000
50,000,000
Fifty million
91234567
91,234,567
Ninety-one million two hundred thirty-four thousand five hundred sixty-seven
Comparison: Indian vs International System
Number
Indian
Indian Name
International
International Name
100000
1,00,000
One Lakh
100,000
One Hundred Thousand
1000000
10,00,000
Ten Lakh
1,000,000
One Million
10000000
1,00,00,000
One Crore
10,000,000
Ten Million
99999999
9,99,99,999
Nine Crore...
99,999,999
Ninety-Nine Million...
[Image: Side-by-side comparison — same number in Indian and International format with colour-coded grouping]
Key Relationships:
1 Lakh = 100 Thousand | 10 Lakhs = 1 Million | 1 Crore = 10 Million | 10 Crores = 100 Million
Reading Large Numbers
Indian System:
3,45,67,890 → Three crore forty-five lakh sixty-seven thousand eight hundred and ninety
7,08,00,501 → Seven crore eight lakh five hundred and one
6,00,40,020 → Six crore forty thousand and twenty
International System:
34,567,890 → Thirty-four million five hundred sixty-seven thousand eight hundred ninety
70,800,501 → Seventy million eight hundred thousand five hundred one
Expanded Form
Write each digit × its place value, then add all together.
Note: Predecessor of 1,00,00,000 → 99,99,999 (crosses digit boundary — 8 digits to 7 digits!)
Real-Life Large Numbers (India)
Fact
Indian System
International System
Population of India
1,40,00,00,000 (140 crore)
1,400,000,000 (1.4 billion)
Population of Mumbai
2,10,00,000 (2 crore 10 lakh)
21,000,000 (21 million)
Chandrayaan-3 cost
₹6,15,00,00,000 (615 crore)
₹6,150,000,000
Earth to Moon
3,84,400 km
384,400 km
Earth to Sun
15,00,00,000 km (15 crore)
150,000,000 km
Railway passengers/day
2,30,00,000 (2.3 crore)
23,000,000 (23 million)
[Image: Infographic — India's population, ISRO rocket, train passengers, Moon distance with large numbers]
Key Words
Term
Meaning
Place Value
Value of digit based on its position
Lakh
1,00,000 (= 100 Thousand)
Crore
1,00,00,000 (= 10 Million)
Million
1,000,000 (= 10 Lakh)
Expanded Form
Number as sum of place values
Predecessor
Number − 1
Successor
Number + 1
Key Points:
• Indian: first comma after 3 digits, then every 2 digits. International: every 3 digits.
• 1 Lakh = 100 Thousand | 10 Lakhs = 1 Million | 1 Crore = 10 Million
• Smallest 8-digit number: 1,00,00,000 | Largest 8-digit: 9,99,99,999
• More digits = greater. Same digits → compare from left.
• Value does NOT change between systems — only grouping and naming changes.
Practice Questions
A. Write the number names in the Indian system:
1. 3,45,67,890
2. 7,08,09,050
3. 1,00,00,001
4. 9,87,65,432
5. 5,05,05,505
B. Write the number names in the International system:
1. 34,567,890
2. 70,809,050
3. 10,000,001
C. Write the following in figures:
1. Six crore thirty-two lakh forty-five thousand seven hundred and eight =
2. Nine crore nine lakh nine thousand and nine =
3. Forty-five million three hundred twenty-one thousand six hundred =
4. Two crore five lakh sixty =
D. Write in expanded form:
1. 6,54,32,100
2. 2,09,08,007
3. 8,00,50,060
4. 4,44,44,444
E. Place commas according to the Indian system:
1. 45678901 =
2. 90030070 =
3. 12345678 =
4. 80000001 =
F. Place commas according to the International system:
1. 45678901 =
2. 90030070 =
3. 12345678 =
4. 80000001 =
G. Compare using >, < or =
1. 4,56,78,900 4,56,79,000
2. 9,99,99,999 1,00,00,000
3. 3,25,47,000 32,547,000
4. 7,00,00,001 6,99,99,999
5. 5,55,55,555 5,55,55,555
H. Write the predecessor and successor:
Number
Predecessor
Successor
4,00,00,000
1,00,00,000
6,50,00,000
9,99,99,999
2,34,56,789
I. Choose the correct answer (MCQ):
1. How many zeros are there in 1 crore?
a) 5b) 6c) 7d) 8
2. 10 lakhs = __________ (International system)
a) 1 Billionb) 1 Millionc) 10 Milliond) 100 Thousand
3. The place value of 6 in 3,64,21,578 is:
a) 6b) 60,000c) 6,00,000d) 60,00,000
4. The smallest 8-digit number is:
a) 99,99,999b) 1,00,00,000c) 10,00,000d) 1,00,00,001
J. Word Problems:
1. The population of Delhi is 1,90,00,000 and the population of Chennai is 87,00,000. Which city has more population? By how much?
2. ISRO spent ₹3,86,00,00,000 on a satellite launch. Write this amount in the International system with commas.
3. Ravi's father said that Indian Railways carries 2,30,00,000 passengers every day. Write this in words (Indian system) and in the International system.
4. Priya wrote "Five crore twenty lakh" as 5,20,000. Is she correct? If not, write the correct number.
Number Line — Large Numbers
[Image: Number line from 1 Crore to 10 Crore with markers at each crore and some numbers in between]
Activity — Large Number Hunt!
Find at least 5 large numbers from newspapers, magazines, or websites. Write them below:
Source
What It Represents
Number (Indian)
Number Name
Example: Newspaper
Population of UP
24,00,00,000
Twenty-four crore
Bonus: Convert any 3 numbers into the International system!
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