Spellings 11–20
MathematicsClass 10CBSEAnswered 19 May 2026
Answer
| Number | Spelling | Number | Spelling |
|---|---|---|---|
| 11 | Eleven | 16 | Sixteen |
| 12 | Twelve | 17 | Seventeen |
| 13 | Thirteen | 18 | Eighteen |
| 14 | Fourteen | 19 | Nineteen |
| 15 | Fifteen | 20 | Twenty |
- 19 = Nineteen, 90 = Ninety (both retain the 'e' from "nine" common error: "Ninty" is wrong)
- XIX = 19 (not 21 IX means 9 via subtractive rule; XXI = 21)
- 11th = Eleventh | 12th = Twelfth
Factors:
| Number | Factors |
|---|---|
| 12 | 1, 2, 3, 4, 6, 12 |
| 15 | 1, 3, 5, 15 |
| 18 | 1, 2, 3, 6, 9, 18 |
| 20 | 1, 2, 4, 5, 10, 20 |
| 21 | 1, 3, 7, 21 |
| 23 | 1, 23 (prime) |
| 24 | 1, 2, 3, 4, 6, 8, 12, 24 |
| 27 | 1, 3, 9, 27 |
| 36 | 1, 2, 3, 4, 6, 9, 12, 18, 36 |
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