A number is called round if it contains at least one zero as a digit. - ProProfs Discuss
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A number is called round if it contains at least one zero as a digit. How many three-digit numbers are round?

This question is part of SAT Math Questions
Asked by Proprofs, Last updated: Apr 29, 2020

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proprofs

Proprofs

Answered Sep 19, 2018

171

An easy strategy here is to just count the number of round numbers between 100 and 199 and multiply that number by 9 for every hundreds digit (100, 200, 300... to 900). So, there are 19 round numbers through 100-199 (100, 101, 102 ... 109 = 10 + and 110, 120, 130... 190 = 9). 19 9 = 171
 

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