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1.
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Jasmine was training for a cross-country race. On the first day she ran 1.464
km. She increased this distance by 0.673 km on the second day. Use mental math to estimate how
far she ran on the second day.
a. | 2.000 km | b. | 2.200 km | c. | 2.100 km | d. | 2.300
km |
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2.
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Use mental math to estimate how far Jasmine ran on both days combined.
a. | 3.500 km | b. | 3.600 km | c. | 3.700 km | d. | 3.400
km |
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3.
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David was also training for a cross-country race. On the first day he ran 1.312
km and on the second day he ran 1.793 km. Use mental math to estimate the total distance he ran on
both days combined.
a. | 3.100 km | b. | 3.000 km | c. | 3.200 km | d. | 3.300
km |
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4.
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The diagram of a park is
shown.
 Use mental math to calculate the
distance around the park. Which shows the estimate and the correct answer? a. | 7.700 km and 6.742 km | c. | 6.000 km and 6.742 km | b. | 5.700 km and 6.742
km | d. | 6.700 km and 6.742
km |
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5.
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Briana has a new puppy, Murphy. His birth mass was 0.514 kg. Briana tracked the
increase in Murphy’s mass over the next 4 months and recorded it in the table
shown. Month | Increase in
mass | January | 0.172 kg | February | 0.204 kg | March | 0.283 kg | April | 0.321 kg | | |
Use mental math to calculate the total mass
that Murphy gained over the 4 months. Which shows the estimate and the correct answer? a. | 1.100 kg and 0.980 kg | c. | 0.900 kg and 0.980 kg | b. | 1.200 kg and 0.980
kg | d. | 1.000 kg and 0.980
kg |
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6.
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Use mental math to calculate Murphy’s mass at the end of April. Which
shows the estimate and the correct answer?
a. | 1.400 kg and 1.494 kg | c. | 1.500 kg and 1.494 kg | b. | 2.000 kg and 1.494
kg | d. | 1.600 kg and 1.494
kg |
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7.
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Use mental math to calculate the sum. Which shows the estimate and the correct
answer?
1.489 +
0.204
a. | 1.600 and 1.693 | c. | 1.800 and 1.693 | b. | 1.700 and 1.693 | d. | 1.500 and 1.693 |
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8.
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Use mental math to determine the missing number.
3.82 + a = 4
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9.
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Use mental math to determine the missing number.
b + 9.025 = 10
a. | 0.875 | b. | 1.075 | c. | 0.075 | d. | 0.975 |
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10.
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Select the correct answer.
0.531 + 0.262
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