Decimals

The times for Erin’s five laps around the track were 56.6 seconds, 57.9 seconds, 57.5 seconds, 65.3 seconds, and 65.7 seconds. Using rounding to the nearest whole second as the only estimation technique, what is the total estimated time for Erin’s five laps in seconds?

• 300

• 303

• 304

• 320

What is the change between January 28th and January 29th

• a loss of 93.98

• a gain of 72.47

• a loss of 14.05

• a gain of 63.47

What is the difference of –89.16 – 154.81?

• -243.97

• -65.65

• 65.65

• 243.97

Jose's mother gave him $10 to go buy groceries. He picked up a gallon of milk for $3.49, three pounds of oranges that cost $1.14 per pound, and a box of cereal for $3.46. Shen used an estimation to determine whether he had enough money for the groceries. How much did he estimate the total cost would be?

• He estimated that he had about $7 worth of groceries.

• He estimated that he had about $9 worth of groceries.

• He estimated that he had about $10.30 worth of groceries.

• He estimated that he had about $10.40 worth of groceries

Seema used compatible (friendly) numbers to estimate the product of

(–25.31)(9.61). What was her estimate?

• -250

• -240

• 240

• 250

Kate gets a paycheck twice a month. Every month, a total of $345.67 is deducted from her paychecks for taxes. If she has received 7 paychecks so far this year, which best represents the total effect the taxes have had on the amount she has earned?

• -2,419.69

• -1,209.85

• 1,209.85

• 2,419.69

Oranges were on sale for $0.45 per pound. Leo bought 12.6 pounds. Which expression shows how to determine the total cost of the oranges?

• 12.6 x 0.45

• 12.6 - 0.45

• 12.6 + 0.45

• 12.6/0.45

Which expression of signed decimal numbers has a positive quotient?

• 2.5 / -9.56

• -1.7 / -10.06

• -0.3 / 9.44

• -9.34 / 0.55

Which problem can be solved by division of decimals?

• How much money does Jon need to buy 10.3 gallons of gas that costs $3.79 a gallon?

• What grade does Maria need on her next test to achieve a total of at least 400 points if she had 4 previous tests that had grades of 75.3, 92.1, 78.6, and 81.0?

• Helena saved $45.00 toward a dress that costs $78.00. How much more does she need to save?

• Mica spent $45.50 on 7 indoor baseball sets. How much does it cost for one set?

Chi needs to simplify the expression below.

(1.25 - 0.4) / 7 + 4 x 3

Which operation should she perform first?

• addition

• subtraction

• multiplication

• division