Cardinal numbers – Exercise 531
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| Number | In words | Comments |
|---|---|---|
| 1 | one | to be remembered |
| 2 | two | |
| 3 | three | |
| 4 | four | |
| 5 | five | |
| 6 | six | |
| 7 | seven | |
| 8 | eight | |
| 9 | nine | |
| 10 | ten | |
| 11 | eleven | |
| 12 | twelve | |
| 13 | thirteen | end with -teen |
| 14 | fourteen | |
| 15 | fifteen | |
| 16 | sixteen | |
| 17 | seventeen | |
| 18 | eighteen | |
| 19 | nineteen | |
| 20 | twenty | round tens end with -ty |
| 21 | twenty-one | a hyphen between tens and ones |
| 89 | eighty-nine | |
| 101 | one hundred and one | and after hundred |
| 999 | nine hundred and ninety-nine | |
| 1,234 | one thousand two hundred and thirty-four | a comma after every 3 digits counting from the right do not add and after thousand, million, billion |
| 2,400,560 | two million four hundred thousand five hundred and sixty | |
| 3,648,820,115 | three billion six hundred and forty-eight million eight hundred and twenty thousand one hundred and fifteen |