Solving Number Problems

Which statement explains how you can use a number line to determine the number that is 4 more than -9?

• Go to -9 on the number line and then move 4 units to the left.

• Go to -9 on the number line and then move 4 units to the right.

• Go to 4 on the number line and then move 9 units to the right.

• Go to 9 on the number line and then move 4 units to the right.

Which equation matches the model?

• -7 - 3 = -4

• 3 + (-7) = -4

• -7 + 3 = 4

• -4 + -3 = -7

Which equation matches this model?

• -7 + 3 = -4

• -4 - 3 = -7

• 4 - 3 = 1

• 4 - (-3) = 7

Determine the unknown number: 5 + ____ = -9

• 4

• 14

• -14

• -4

Mr. Grant spends $295 each month to lease a car. Which is the best estimate of how much he spends to lease a car for 72 months?

• $21,000

• $3,000

• $27,000

• $30,000

Determine the unknown number: ____ - (-8) = -9

• 17

• -17

• 1

• -1

Determine the unknown number: ____ x -9 x -1 = -9

• 9

• -9

• 1

• -1

• 0

Determine the unknown number: ____ ÷ -5 x 4 = -20

• 25

• -25

• -20

• 20

• 1

Evaluate 7¾ + (-2⅕)k for k = -10

• -55½

• -14¼

• 29¾

• 99½

Andrew estimated he would need 30 minutes to complete his purple study guide. He actually needed 2.5 hours. What was his percent error? Round to the nearest whole percent.

• 80%

• 20%

• 11%

• 92%