Estimating Sums and Differences
Round each decimal to the nearest whole number, then find the sum.
5.65 + 3.27
5.65 rounds to 6.
3.27 rounds to 3.
6 + 3 = 9
Find the sum.
2.66 + 8.51
11.17
Find the difference.
9.64 - 6.72
2.92
Round each decimal to the nearest whole number, then find the difference.
9.8 - 7.1
9.8 rounds to 10.
7.1 rounds to 7.
10 - 7 = 3
Find the sum.
1.37 + 9.09
10.46
Find the difference.
1.34 - 0.82
0.52
Round each decimal to the nearest whole number, then find the sum.
85.4 + 33.6
85.4 rounds to 85.
33.6 rounds to 34.
85 + 34 = 119
Find the sum.
43.12 + 64.28
107.40
Find the difference.
56.18 - 37.09
19.09
Round each decimal to the nearest whole number, then find the difference.
125.34 - 93.02
125.35 rounds to 125.
93.02 rounds to 93
125 - 93 = 32
Find the sum.
405.3 + 226.8
632.1
Find the difference.
76.6 - 17.8
58.8
Round each decimal to the nearest whole number, then find the sum.
4.55 + 9.8 + 10.24
4.55 rounds to 5.
9.8 rounds to 10.
10.24 rounds to 10.
5 + 10 + 10 = 25
Find the sum.
107.5 + 335.25
442.75
Find the difference.
849.81 - 574.26
275.55