Which estimation could be used to make sure the answer is reasonable? sofia mixed 3.15 l of grape juice with 4.75 l of cranberry juice. her friends drank 3.95 l of the juice mixture. how much juice was left over?

a.
the amount left over was 4.05 l.
estimation: 3.15 + 4.75 is about 7.
7 l – 4 l = 3 l
the amount left over was about 3 l.

b.
the amount left over was 3.95 l.
estimation: 3.15 + 4.75 is about 8.
8 l – 4 l = 4 l
the amount left over was a little less than 4 l.

c.
the amount left over was 11.85 l.
estimation: 3.15 + 4.75 is about 8 l.
8 l + 4 l = 12 l.
the amount left over was a little less than 12 l.

Let's go through each answer. 

A.
The amount left over was 4.05 L.
Estimation: 3.15 + 4.75 is about 7.
7 L – 4 L = 3 L
The amount left over was about 3 L.

This is incorrect because 3.15+4.75 is closer to 8 than 7.

B.
The amount left over was 3.95 L.
Estimation: 3.15 + 4.75 is about 8.
8 L – 4 L = 4 L
The amount left over was a little less than 4 L.

This is correct because 3.15+4.75 is close to 8 and to find the amount left over you do have to subtract. 

The correct answer is B.
The amount left over was 3.95 L.
Estimation: 3.15 + 4.75 is about 8.
8 L – 4 L = 4 L
The amount left over was a little less than 4 L.

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You can add any mathematics symbol that makes the equation reasonable.

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