Question

How many times the digit 9 occur in the units’ place in all the natural

numbers up to 100?

Answer 1

Answer:

Between 1 and 100, the digit 9 occurs in 9, 19, 29, 39, 49, 59, 69, 79, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98 and 99. ∴ The digit occurs 20 times between 1 and 100.

Answer 2

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Between 1 and 100, the digit 9 occurs in 9, 19, 29, 39, 49, 59, 69, 79, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98 and 99.

∴ The digit occurs 20 times between 1 and 100.