Maths / Knowing Our Numbers / Comparing Numbers

QUESTION
 

How many times does the digit 1 appears in number 1-100?

OPTIONS
A. 

18

B. 

19

C. 

20

D. 

21

Right Option : D

EXPLANATION
Explain TypeExplanation Content
Text

Digit 1 appears in number 1-100 is as follows:

From 1 to 10 = 2 times

From 11 to 20 = 10 times

From 21 to 30, 31 to 40 and so on till 81 to 90 = 1 time each = 1 x 7 = 7

From 91 to 100 = 2 times

Total = 2 + 10 + 7+ 2 = 21

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