Daily Math Challenge

Sharpen your math skills with a new problem every Tuesday to Friday. These daily challenges are perfect for those who enjoy quick, engaging puzzles.

Problem 1420

Posted: September 16, 2025

87 % of users got this correct

A certain three-digit number increases by 9 if you exchange the tens and ones digits.  The same three-digit number increases by 90 if you exchange the hundreds and tens digits.  How much will the number increase if you exchange the hundreds and ones digits?

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