Operations with Rational Numbers

Adding Rational Numbers

100

3.15 + 2.25

What is 5.40?

200

0.38 + (-1.2)

What is -0.82?

300

9/25 + (-17/25)

What is -8/25?

400

-5/12 + 1/12

What is -1/3?

500

To make a small amount of play dough, you can mix 1 cup of flour, 1/2 cup of salt and 1/2 cup of water. What is the total amount of ingredients added to make the play dough?

What is 2 cups?

Subtracting Rational Numbers

100

8/11 - 3/11

What is 5/11 ?

200

- 4/13 - 8/13

What is -12/13 ?

300

-0.06 - (-0.86)

What is 0.8 ?

400

-10/24 - (-2/24)

What is -1/3 ?

500

The snowfall in Rochester, NY in the winter of 1999-2000 was 91.5 inches. Normal snowfall is about 76 inches per winter. How much more snow fell in the winter of 1999-2000 than is normal?

What is 15.5 inches?

Multiplying Rational Numbers

100

5(1/3)

What is 1 and 2/3 ?

200

-3.2 x 5

What is -16?

300

-1/6 (-2/3)

What is 1/9?

400

2/3(-4) = 

What is -6 ?

500

The temperature is 40^oF. It will fall 2 degrees each our for 12 hours. What is the final temperature?

What is 16^oF?

Dividing Rational Numbers

100

1/4 divided by 3/8

What is 2/3?

200

-20 divided by 0.5

What is -40?

300

-15 divided by -5/8

What is 24?

400

Emma bought 2 and 1/2 yards of cording for the trim around the edge of a square pillow. There are 4 edges that she will cover. How much will she use for each side of the pillow?

What is 5/8 yard?

500

Sean has a loan of $8804.46 including interest. He makes payments of $209.63 each month on the simple interest loan. How many months will it take for Sean to repay his loan?

What is 42 months?