Adding and Subtracting Integers

Adding and Subtracting Integers

by Kevvin Hankins

Adding and Subtracting integers

Learning Goal

I can add and subtract integers and list my steps in order.

Let's review what we learned about Adding and Subtracting integers.

• Adding integers can be solved using tiles, a number line or the rules.

• Subtracting integers can be solved using tiles, a number line or the rules.

• To find the sum means to add.

• To find the difference means to subtract

Adding integers rules

• Same sign, add and keep the sign.

• Different sign? Subtract and keep the sign of the # that is larger.

Subtracting integers rules

• Keep the first number.

• Change subtraction to addition.

• Change the sign of the last #

• Then follow the addition rules

Now let's try some!

Multiple Choice

5+(-5)

• 5

• -5

• 0

• 10

Multiple Choice

-2 + 4 

• -2
• 2
• 0
• -4

Multiple Choice

Use the tiles to find the sum of the integers.

• -5

• -7

• 5

• 7

Multiple Choice

-7 - 2

• -9
• 9
• 5
• -5

Multiple Choice

-2 - (-10) = ?

• -12
• 12
• 8
• -8

Multiple Choice

33 + (-38)

• -5
• 5
• 71
• -71

Multiple Choice

19 - (-19)

• 0
• 36
• 26
• 38

Multiple Choice

5-19

• 14
• 24
• -14
• -24

Multiple Choice

What are the rules for subtracting integers?

• Change to multiplication and use the opposite of the second number.

• Keep the first #. Change subtraction sign to addition and Change the last number into its opposite.

• Keep the opposite of both numbers and then change it to add.

• Subtract like normal and keep the larger sign.

Multiple Choice

Solve the problem using the given tiles.

• 9

• 10

• -9

• -10

Multiple Choice

Solve the problem using the given tiles.

• 7

• 5

• -7

• -5

Multiple Choice

What problem is shown with this number line?

• 3 - 2

• 2 - 3

• 3 - (-2)

• 5 - 2

Multiple Choice

10 + (-4) 

• -6
• 6
• 14
• -14

Multiple Choice

16 - (-9) 

• -7
• 11
• 15
• 25

Multiple Choice

What is the opposite of 5?

• 5

• -5

• 1/5

• -1/5

Multiple Choice

Final question....

Which problem does not have a sum of (-4)?

• (-9) + (-5)

• 3 + (-7)

• (-9) + 5

• (-3) + (-1)