4 operations with rationals

For subtraction we use “Add a _________, AND change the sign

In multiplication, if you have 2 of the same sign the answer will be...

• positive

• negative

• the sign of the larger number

• the sign of the smaller number

In division, if you have 2 different signs the answers will be....

• Positive

• negative

• the sign on the larger number

• the sign of the smaller number

(-¾ ) + (-¼ ) =

 72 / (-8) = _____

• 9

• -9

• 1/9

• -1/9

 -12 * 3 = _____

• 4

• 36

• -4

• -36

  -11 - (-9) = _____

• 2

• -2

• 20

• -20

A gopher is in a hole that is 6 1/4 in. below the surface of the ground. It then digs

7 1/2 in. deeper. What is the gopher’s new elevation relative to the surface of the ground?

• 55/4

• -55/4

• 63/4

• -63/4

A recipe calls for 3/4 cup of sugar you want to make 1/2 of the recipe. How much sugar do you need?

• 3/4 cup

• 4/6 cup

• -4/6 cup

• 3/8 cup

Thomas was able to fill 1 and 2/3 buckets with a total of 4/5 liters of paint. How much paint is in each bucket?

• 20/15 liters

• 8/15 liters

• 12/25 liters

• 25/12 liters