A number line helps you see how integers are added.
On a number line,
    • when you add positive integers, move to the right.
    • when you add negative integers, move to the left.

Positive + Positive

This is covered in the Fast Addition topic.

Positive + Negative

3 + ^-5

a.	Start at +3 on the number line
b.	From +3, move 5 to the left to add -5
	You end up at -2

3 + ^-5 = ^-2

Negative + Positive

^-3 + 4

a.	Start at -3 on the number line
b.	From -3, move 4 to the right to add +4
	You end up at +1

^-3 + 4 = 1

Negative + Negative

^-1 + ^-3

a.	Start at -1 on the number line
b.	From -1, move 3 to the left to add -3
	You end up at -4

^-1 + ^-3 = ^-4

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