| 0–12 | each has its own word; -teen starts at 13 | zero / eleven / twelve |
| -teen | 13–19 add stressed -teen; 13, 15 and 18 change their first part | thirteen /θɜːˈtiːn/ · fifteen · eighteen |
| -ty | tens end in -ty and the stress is on the first part | thirty /ˈθɜːti/ · forty |
| 21–99 | ten + hyphen + unit | twenty-one / forty-five |
| hundred, thousand, million | they stay singular after a number; and comes after hundred | two hundred and fifty / five million |
| Ordinals | the order of things: first, second, third; from 4 add -th | My flat is on the second floor. / the fourth of July |
| Short ordinals | number + the last two letters of the word | 1st / 2nd / 3rd / 4th |
| Compound ordinals | only the last word changes | twenty-first / a hundred and second |
| Phone numbers | say each digit; 0 is oh; two equal digits are double | 077 → oh double seven |
| Comma and point | a comma separates thousands; a point separates decimals | 1,500 / 2.5 → two point five |
| Trap | five, nine, twelve and twenty change their spelling in ordinals | fifth / ninth / twelfth / twentieth |
| Trap | forty drops the u that fourteen keeps | fourteen ≠ forty |