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MathematicsCLASS 10CBSE
answered 19 May 2026

Spellings 11–20

A.VERIFIED ANSWERfact-checked by tutors
NumberSpellingNumberSpelling
11Eleven16Sixteen
12Twelve17Seventeen
13Thirteen18Eighteen
14Fourteen19Nineteen
15Fifteen20Twenty
  • 19 = Nineteen90 = 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:

NumberFactors
121, 2, 3, 4, 6, 12
151, 3, 5, 15
181, 2, 3, 6, 9, 18
201, 2, 4, 5, 10, 20
211, 3, 7, 21
231, 23 (prime)
241, 2, 3, 4, 6, 8, 12, 24
271, 3, 9, 27
361, 2, 3, 4, 6, 9, 12, 18, 36

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