Adding Integers Quick Review Slides- Lisi

Adding Integers

A Quick Review

Integers are ...

positive and negative whole numbers

{...-3, -2, -1, 0, 1, 2, 3, ...}

The Integers can be visualized with the number line.

As you move to the left, the numbers get smaller.

As you move right, the numbers get bigger

A useful way to think of it:

Negative numbers are to the left, so minus means "go left".

Positive numbers are to the right, so plus means "go right".

Adding numbers with the same sign

• Add the numbers and keep the sign

Example:

+2+5=+7

-2+-5=-7

is the same as

-2-5=-7

Adding numbers with opposite signs

Subtract the numbers and keep the sign of the "bigger" number

Example

5+-2=3

-5+2=-3

Similarly...

-2+5=+3

2+-5= -3

Multiple Choice

Add -10+3=

• 7

• -7

• -30

• none of these

Poll

This Short lesson.....

• Didn't help me at all

• Helped me a little

• Was a good refresher for me

• I get it now!