# Chapter 1

**Created:**2017-01-10

**Last Modified:**2017-01-30

__627 to the nearest 10, you get 630__

**Example:**(2+5)+4=2+(5+4)

**Example:**3,714+2,489+781=?

Label the numbers

9 - 4 = 5

4=Subtrahend

5=Difference

**Example:**9-4=5 because 4+5=9

**Example:**27-16+5

^{2}

**Example:**12÷4=3 is true because 3·4=12

^{R-k}

28

/ \

2 14

/ \

2 7

The **prime factors of 28 are**: 2 and 7

^{3(exponent)}

^{}

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