7th Grade: Operations with Rational Numbers

Word Problems

100

Maria spent $29.20 on 4 shirts that each cost the same amount of money. How much money did each shirt cost?

$7.30

200

Jason had a breakfast party. He invited 3 of his best friends. Each friend brought 2 and 1/2 cups of coffee. How much coffee did they all bring together?

7 and 1/2 cups of coffee

300

The snowfall in Rochester, NY in the winter of 1999-2000 was 91.5 inches. Normal snowfall is about 76.8 inches per winter. How much more snow fell in the winter of 1999-2000 than is normal?

14.7 inches

400

To make a small amount of play dough, you can mix 1 cup of flour, 1/4 cup of salt and 1/2 cup of water. How many cups of ingredients do you need in total to make the play dough?

1 and 3/4 cups

500

Sara had 13 quarters in her piggy bank. Her dad gave her 16 quarters and her mom gave her 11 quarters and 4 dimes. How much money does Sara have now?   

$10.40 

Adding Rational Numbers

100

3.15 + 2.25

5.40

200

0.38 + (-1.2)

-0.82

300

9/25 + (-17/25)

-8/25

400

-5/4 + 1/12

-14/12

500

-13+(-1/2)

-13.5 or -13 and 1/2

Subtracting Rational Numbers

100

8/11 - 3/11

5/11

200

- 4/13 - 8/13

-12/13

300

-0.06 - (-0.86)

0.8

400

-5/12 - (-2/24)

-1/3

500

105-206-(-101)

0

Multiplying Rational Numbers

100

5(1/3)

5/3 or 1 and 2/3

200

-3.2(5)

-16

300

-1/6 (-2/3)

1/9

400

-2.57 (-.5)

1.285

500

2(4)(5)(-1)

-40

Dividing Rational Numbers

100

-60/4

-15

200

1/5 divided by 3/8

8/15

300

-20.5/0.5

-41

400

-6 divided by -3/4

8

500

2 and 2/3 divided by -1 and 3/5 

-1 and 2/3 or -5/3