Operations of decimals

At the beginning of a laboratory experiment, the temperature of a substance is -12.6 °C. During the experiment, the temperature of the substance decreases 7.5°C. What is the final temperature of the substance?

• 2.2 °C
• -5.1 °C
• -20.1 °C
• 25.9 °C

Tags

CCSS.7.NS.A.1C

-12.4 + 9.2 + 1 

• 22.6
• -2.2
• -15.8
• 17.9

Tags

CCSS.7.NS.A.1C

 -6.64 ÷ -0.4 =

• 6.24
• -16.6
• 16.6
• -6.24

Tags

CCSS.7.NS.A.2B

 Sandy has $200 in her bank account. If she writes 6 checks for exactly $19.98, what is her account balance after the checks are cashed?

• $80.12
• -$180.02
• -$57.90
• $319.88

Tags

CCSS.7.NS.A.3

2.75 + (-2) + (-5.25) = 

• 8.3
• 0.5
• -10
• -4.5

Tags

CCSS.7.NS.A.1C

Greg sets his watch for the correct time on Wednesday. Exactly one week later, he finds that his watch has lost 3.25 minutes. If his watch continues to lose time at the same rate, what will be the overall change in time after 8 weeks?

• 26 minutes behind
• 35 minutes behind
• 15 minutes ahead
• 21 minutes ahead

Tags

CCSS.7.EE.B.3

Sanin went to the store to buy groceries. He bought a box of cereal for $5.29, a gallon of milk for $2.49, and a quart of juice for $3.79. He paid the cashier with a $20 bill. How much change did Sanin receive?

• $11.57
• $20.11
• $8.43
• $1.23

Tags

CCSS.6.NS.B.3

-2.4(3)

• -72
• -.72
• -.072
• -7.2

Tags

CCSS.7.NS.A.2B

CCSS.7.NS.A.2A

Three rock climbers started a climb with each person carrying 7.8 kilograms of climbing equipment. A fourth climber with no equipment joined the group. The group divided the total weight of climbing equipment equally among the four climbers. How much did each climber carry?

• 8.8 kg
• 1.95 kg
• 5.85 kg
• 3.25 kg

Tags

CCSS.6.NS.B.3

-3.2 (-5.6 )(4 )

• 12.8
• 7.168
• 71.68
• 1.28

Tags

CCSS.7.NS.A.2C