Integers

Integers

The counting numbers, their opposites and 0

Integers can be positive or negative

0 is also an integer although it is neither positive nor negative

Integers can also be...

• decimals

• fractions

• square roots

• cubed roots

We can use integers to solve problems

Some are easy

Multiple Choice

What is 5 + 4 =

• 10

• 9

• 3

• 1

When adding negative and positive integers it is like subtracting but keep the bigger sign

• -4 + 3 =

• Is the same as 4-3 = 1

• -4 was bigger though so your answer is -1

Sometimes it is easier to use a number line

• -5 + 3 =

• start at the first number so -5 and count in the direction of the second number ( + to the right and - to the left)

• then count the second number

• so -5 and then 3 spaces to the right = -2

4 + -2 =

Start at 4 and move 2 spaces to the left = 2

Multiple Choice

-3 + -1 =

• 2

• 4

• -4

• -2

Multiple Choice

4 + (-3) =

• 0

• 1

• -1

• 7

Multiple Choice

-2 + - 2 =

• 5

• 4

• -4

• 0

Multiple Choice

-4 + 4 =

• 8

• -8

• 0

• 1

When subtracting positive integers it is easy

Multiple Choice

7 - 2 =

• 4

• 5

• 2

• 9

When subtracting negative and positive integers ALWAYS Keep, Change, Change

• This makes it addition

• And addition is easier to solve

-3 - 2 =

• keep, change, change

• -3 + -2 =

• then use your number line or do it in your head =

• -5

Multiple Choice

2 - (-3) =

keep, change, change

2 + 3 =

• 6

• 3

• 5

• 1

Multiple Choice

-1 - 3 =

• 2

• 4

• -4

• -2