Addition and Subtraction Equation

Solve
4 = 2 + x

• x = 6

• x = 2

• x = 8

• x =-2

Solve
12 = y + 5

• y = 17

• y = -7

• y = 8

• y = 7

Solve
34.7 = y + 5.3

• y = 29.4

• y = 30.4

• y = 28.4

• y = 40

Together Brissa and Tania have 12 cats. If Brissa has 3, write an equation to find out how many cats Tania has.

• 12 - 3

• 12 = x - 3

• x + 3 = 12

• x = 9

Solve
x - 9 = 15

• x = 6

• x =-6

• x = 23

• x = 24

Solve
x - 11 = 3

• x = 9

• x =-9

• x = 14

• x = 13

Solve
17 = x - 20

• x = 3

• x = 37

• x = -3

• x = -37

Solve
1.54 = x - 2.9

• x = 4.44

• x = 1.36

• x = 4.34

• x = 1.37

Why do you add 7 to both sides?

• To undo addition, you subtract.

• To balance the equation, you subtract 7 on both sides.

• To undo subtraction, you add.

• To balance the equation,you add 7 to both sides.

What is the inverse operation of addition?

• Addition

• Subtraction

• Multipication

• Division