1
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Which number line correctly shows –0.8 + 0.6?
A
A number line going from negative 1.6 to positive 1.6. An arrow goes from negative 0.8 to negative 0.2, and then backwards from 0 to negative 0.8.
B
A number line going from negative 1.6 to positive 1.6. An arrow goes from 0 to negative 0.8 and then from negative 0.8 to negative 1.4.
C
A number line going from negative 1.6 to positive 1.6. An arrow goes from 0 to 0.8 and then from 0.8 to 1.4.
D
A number line going from negative 1.6 to positive 1.6. An arrow goes from negative 0.6 to 0.2 and then from 0 to negative 0.6.
2
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Oni was timing her 100 meter sprints. Her first five sprints were 12.568 seconds, 11.426 seconds, 12.324 seconds, 11.981 seconds, and 12.601 seconds. Which two estimation techniques will give the same result for the total number of seconds for all five sprints?
A
front-end and clusteringB
front-end and rounding to the nearest tenthC
clustering and rounding to the nearest tenthD
rounding to the nearest tenth and rounding to the nearest hundredth3
Which number line correctly shows 0.8 + 0.3?
A
A number line going from 0 to 1.3 in increments of 0.01. An arrow goes from 1.1 to 0.3 and from 0.3 to 0.
B
A number line going from 0 to 1.3 in increments of 0.01. An arrow goes from 0 to 0.8 and from 0.8 to 1.1.
C
A number line going from 0 to 1.3 in increments of 0.01. An arrow goes from 0 to 0.8, and then backwards from 0.8 to 0.5.
D
A number line going from 0 to 1.3 in increments of 0.01. An arrow goes from 0.3 to 1.1 and then backwards from 1.1 to 0.8.
4
Shen’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 front-end estimation to determine whether he had enough money for the groceries. How much did he estimate the total cost would be?
A
He estimated that he had about $7 worth of groceries.B
He estimated that he had about $9 worth of groceries.C
He estimated that he had about $10.30 worth of groceries.D
He estimated that he had about $10.40 worth of groceries.Did you find these answers helpful?
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