One-Step Equations with Rational Numbers

x + 8 = 15

• x = 23
• x = 7
• x = 120
• x = 15/8

What is the inverse operation of subtraction?

• Addition

• Division

• Multiplication

• Subtraction

• w=12

• w=42.2

• w=22.3

• w=16.4

Select the equation that best represents the situation: Mrs. Lamb is baking a cake. The recipe calls for nine cups of flour. She already put in two cups. 

• r + 2 = 9

• 2r = 9

5 n = 30

• n = 150
• n = 25
• n = 5
• n = 6

In 2010, a tree was 8 feet tall. In 2011 the tree was 14 feet tall. Which equation would be used to find how many feet the tree grew?

• f + 8 = 14

• f - 8 = 14

• f/8 = 14

• 8f=14

13 + y = 20

• y = 13
• y = 33
• y = 7
• y = 20/13

x - 10 = 20

• x = 20/10
• x = 20
• x = 10
• x = 30

• r=23.7

• r=100.1

• r=12.7

• r=90.1