AnswersGrade 7 MathematicsAdding and Subtracting Decimals

Adding and Subtracting Decimals — Quiz Answers

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Shen’s mother gave him 10 dollars to go buy groceries. He picked up a gallon of milk for 3 point 4 9 dollars , three pounds of oranges that cost 1 point 1 4 dollars per pound, and a box of cereal for 3 point 4 6 dollars 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 10 point 4 0 dollars worth of groceries.
B
He estimated that he had about 10 point 3 0 dollars worth of groceries.
C
He estimated that he had about 9 dollars worth of groceries.
D
He estimated that he had about 7 dollars worth of groceries.
2
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The times for Erin’s five laps around the track were 56 point 6 seconds, 57 point 9 seconds, 57 point 5 seconds, 65 point 3 seconds, and 65 point 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?

A
303
B
304
C
320
D
300
3

What is the sum of negative 356 point 1 plus 258 point 6 ?

A
negative 614 point 7
B
negative 97 point 5
C
97 point 5
D
614 point 7
4

Which number line correctly shows negative 0 point 8 plus 0 point 6 ?

A
Image with description A number line from negative 1 point 6 to 1 point 6 by two-tenths. A ray extends from 0 to negative 0 point 8. A second ray above it extends from negative 0 point 8 to negative 0 point 2.
B
Image with description A number line from negative 1 point 6 to 1 point 6 by two-tenths. A ray extends from 0 to negative 0 point 8. A second ray extends from negative 0 point 8 to negative 1 point 4.
C
Image with description A number line from negative 1 point 6 to 1 point 6 by two-tenths. A ray extends from 0 to negative 0.6. A second ray above it extends from negative 0.6 to 0 point 2.
D
Image with description A number line from negative 1 point 6 to 1 point 6 by two-tenths. A ray extends from 0 to 0 point 8. A second ray extends from 0 point 8 to 1 point 4.
5

What is the difference of negative 89 point 1 6 minus 154 point 8 1 ?

A
negative 243 point 9 7
B
negative 65 point 6 5
C
243 point 9 7
D
65 point 6 5
6

Which number line correctly shows negative 3 minus 1 point 5 ?

A
Image with description A number line from negative 4 point 5 to 4 point 5 by halves. A ray extends from 0 to 3. A second ray extends from 3 to 4 point 5.
B
Image with description A number line ranges from negative 4 point 5 to 4 point 5 by halves. A ray extends from 0 to negative 1 point 5. A second ray above it extends from negative 1 point 5 to 1 point 5.
C
Image with description A number line from negative 4 point 5 to 4 point 5 by halves. A ray extends from 0 to negative 3. A second ray extends from negative 3 to negative 4 point 5.
D
Image with description A number line ranges from negative 4 point 5 to 4 point 5 by halves. A ray extends from 0 to negative 3. A second ray above it extends from negative 3 to negative 1 point 5.
7

Oni was timing her 100 meter sprints. Her first five sprints were 12 point 5 6 8 seconds, 11 point 4 2 6 seconds, 12 point 3 2 4 seconds, 11 point 9 8 1 seconds, and 12 point 6 0 1 seconds. Which two estimation techniques will give the same result for the total number of seconds for all five sprints?

A
front-end and rounding to the nearest tenth
B
rounding to the nearest tenth and rounding to the nearest hundredth
C
clustering and rounding to the nearest tenth
D
front-end and clustering
8

Aisha changed 1 point 4 5 plus 2 point 3 8 to 1 point 5 plus 2 point 4 in order to estimate the sum. What estimation method did she use?

A
front-end
B
clustering
C
rounding to the nearest tenth
D
rounding to the nearest hundredth
9

Which number line correctly shows 0 point 8 plus 0 point 3 ?

A
Image with description A number line from 0 to 1 point 3 by tenths. A ray extends from 1 point 1 to 0 point 3. A second ray extends from 0 point 3 to 0.
B
Image with description A number line from 0 to 1 point 3 by tenths. A ray extends from 0 point 3 to 1 point 1. A second ray above it extends from 1 point 1 to 0 point 8.
C
Image with description A number line from 0 to 1 point 3 by tenths. A ray extends from 0 to 0 point 8. A second ray above it extends from 0 point 8 to 0.5.
D
Image with description A number line from 0 to 1 point 3 by tenths. A ray extends from 0 to 0 point 8. A second ray extends from 0 point 8 to 1 point 1.
10

What is the value of negative 112 point 8 4 minus 54 point 1 4 minus negative 29 point 1 8 ?

A
negative 137 point 8
B
196 point 1 6
C
87 point 8 8
D
negative 29 point 5 2

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