Addition Subtraction One Step Equations

The Addition Property of Equality states that if:

a = b

then...

• a + c = b + d

• a = b + c

• a + b = a + b

• a + c = b + c

To solve: 14 = x + 32

• Add -32

• Add 32

• Subtract 14

• Subtract -14

90 = x - 27

• Add 90

• Subtract 90

• Add -27

• Add 27

The Subtraction Property of Equality states that if:

a = b

then...

• a - b = a - b

• a - c = b - c

• a - c = b

• a = b

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.

How do you solve this equation?

• add 21 to both sides

• add 6 to both sides

• subtract 21 from both sides

• subtract 6 from both sides

Solve the equation:
20.5 = x + 4

• 16.5

• 16.05

• 24.5

• 24.05

Solve the equation: z + 19 = 35

• z = 13

• z = 14

• z = 15

• z = 16

Solve the equation
1/4 + x = 7/8

• 1

• 6/7

• 5/8

• 2/3

Solve the equation. 
  z- 2⅓= 1⅔

• z= 4

• z= 3

• z= 2⅓

• z= 3⅔