# Chapter 1 - Some Basic Concepts of Arithmetic and Algebra - 1.5 - Use of Properties - Problem Set 1.5 - Page 33: 30

$15$

#### Work Step by Step

The given expression reads: $24-26-29+26+18+29-17-10$ The expression can be rearranged as: $26-26+29-29+24+18-17-10$ The first four terms can be grouped as $(26-26)$ and $(29-29)$ so that it is easy to see that they cancel out. Thus, the current expression is: $24+18-17-10$ We may then further group the terms so that they are easier to subtract: $(24-10)$ and $(18-17)$ This results in: $14+1 = 15$

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