7th Grade: Operations with Rational Numbers

CovertingFraction/Decimal

100

What is the additive inverse to -0.25?

0.25

200

What is 0.82 as a fraction in simplest form?

41/50

300

How would you write 2.6 as a mixed number?

2  3/5

500

Convert 5 7/8 into an improper fraction.

47/8

500

The world's smallest country is Vatican City. Its area is 0.17 square miles. Express this value as a fraction in simplest form.

17/100

Adding Rational Numbers

100

3.15 + 2.25

5.40

200

0.38 + (-1.2)

-0.82

300

9/25 + (-17/25)

-8/25

500

-5/4 + 1/12

-1 1/6

500

The bakery begins with 250 pounds of flower each week. How much will they have by the end of the day Wednesday?
Monday =  -63.5 pounds
Tuesday  = -71 3/5 pounds
Wednesday = -65.9 pounds

49 pounds

Subtracting Rational Numbers

100

8/11 -  (-3/11)

11/11 = 1

200

- 4/7 - 8/9

-1  29/63

300

Solve a - b if a = 0.36 and b = -5/6

1.16

500

2 1/4 - 9 1/3 

-7  1/12

500

The snowfall in Rochester, NY in the winter of 1999-2000 was 91.3 inches. Normal snowfall is about 76.6 inches per winter. How much more snow fell in the winter of 1999-2000 than is normal?

14.7 inches

Multiplying Rational Numbers

100

5(1/3)

1 and 2/3

200

-3.2 x 5

-16

300

-1/6 (-2/3)

1/9

500

Find the area of a rectangle if the length = 1 1/3 cm and width = 4 4/5 cm.

6.4 cm² or 6 2/5 cm²

500

Solve abc if a = 0.3, b = -1/5 and c = 2 1/4 

-0.135 or -27/200

Dividing Rational Numbers

100

1/4 divided by 3/8

2/3

200

Solve a/b if a = 1 7/8 and b = -1/4

-7.5 or -7 1/2

300

-15 divided by -5/8

24

500

Emma bought 2 and 1/2 yards of ribbon to make bows for 4 of her friends. How much yard will she use for each ribbon?

5/8 yards 

500

C = 5(F-32)/9

Convert -13 degrees Fahrenheit to Celsius.

-25 degrees Celsius