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Answer Key
Grade 5 Math: Estimation & Mental Math with Decimals/Fractions
1.
find an approximate value without exact calculation
2.
a familiar fraction used for comparison (½, ¼, ¾…)
3.
4
4.
0.5
5.
1
6.
about 6
7.
about 10
8.
judge reasonableness / catch errors
9.
about 9 (7+2) or about 9.1
10.
0, ½, 1 (also ¼, ¾)
11.
about 15 / near 3×5=15 (not 12 or 20 alone)
12.
8.4
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