Big numbers are grouped differently depending on the system you use. Enter a number and switch between the Indian and International place value systems.
Try it: switch systems and watch the same number get grouped differently!
Large numbers are grouped differently depending on the system used. The Indian system groups digits as ones, tens, hundreds, thousands, lakhs, and crores. The International system groups digits as ones, tens, hundreds, thousands, millions, and billions.
Groups of 2 after the first 3 digits: ones, thousands, lakhs, crores.
Groups of 3 throughout: ones, thousands, millions.
Roman numerals use letters to represent numbers, a system from ancient Rome still used today on clocks, book chapters, and monuments.
| Roman | Value | Roman | Value |
|---|---|---|---|
| I | 1 | L | 50 |
| V | 5 | C | 100 |
| X | 10 | D | 500 |
| M | 1000 |
When a smaller symbol comes after a larger one, add: VI = 5 + 1 = 6
When a smaller symbol comes before a larger one, subtract: IX = 10 − 1 = 9
BODMAS tells us the correct order to solve a maths expression with multiple operations: Brackets, Orders (powers), Division, Multiplication, Addition, Subtraction.
Solve: 4 + 6 × 2. Multiplication first: 6 × 2 = 12. Then add: 4 + 12 = 16
Solve: (4 + 6) × 2. Brackets first: 4 + 6 = 10. Then multiply: 10 × 2 = 20
Write 4523891 with Indian place value commas.
45,23,891 — forty-five lakh, twenty-three thousand, eight hundred ninety-one
Convert XL to a number. X comes before L (smaller before larger), so subtract: 50 − 10 = 40
Solve: 20 − 8 ÷ 2 + 3. Division first: 8 ÷ 2 = 4. Then left to right: 20 − 4 + 3 = 19
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