Adding Integers

The Number Line

Integers = {…, -2, -1, 0, 1, 2, …}

-5 0 5

Addition Rule1) When the signs are the same,

ADD and keep the sign.(-2) + (-4) = -6

2) When the signs are different,

SUBTRACT and use the sign of the larger number.

(-2) + 4 = 2

2 + (-4) = -2

Song

Addition Rule: Sung to the tune of “Row, row, row, your boat”

Same signs add and keep,different signs subtract,

keep the sign of the higher number,then it will be exact!

Another way to Add Integers Is With a Number Line

0 1 2 3 4 5 6-1-2-3-4-5-6

When the number is positive countto the right.

When the number is negative countto the left.

+-

One Way to Add Integers Is With a Number Line

0 1 2 3 4 5 6-1-2-3-4-5-6+

-

3 + -5 = -2

One Way to Add Integers Is With a Number Line

0 1 2 3 4 5 6-1-2-3-4-5-6-

+

-3 + 7 = +4

One Way to Add Integers Is With a Number Line

0 1 2 3 4 5 6-1-2-3-4-5-6-

-

-4 + -2 = -6

Examples: Use the number line if necessary.

4

2) (-1) + (-3) =

-4

3) 5 + (-7) =

-2

0 5-5

1) (-4) + 8 =

-1 + 3 = ?1. -4

2. -2

3. 2

4. 4

Answer Now

-6 + (-3) = ?1. -9

2. -3

3. 3

4. 9

Answer Now