How many of the three-digit numbers are divisible by 7?

105

106

127

128

142

Explanation Given:

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Approach One: Divide all of the three-digit numbers

999 - 100 + 1 = 900 (Don't forget to add 1 to get the number of all the 3-digit numbers) by 7, which is 128.57, and then round it off to 128.

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My question: When you round 128.57 shouldn't it result in 129? In this case in the answer choices there was no 129, but what if on the D-Day there is 129? What would you do then?

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