2-2 Rounding
2-3 Estimating Sums and Differences
2-6 Adding Decimals
2-7 Subtracting Decimals
Multiplication Facts
100
Round to the tenths place value. 5.742
5.700
100
ESTIMATE the sum. 79 + 32 =
80 + 30 = 110
100
6.9 + 2.8 =
6.9 + 2.8 = 9.7
100
7.8 - 4.9 =
7.8 - 4.9 = 2.9
100
5 x 7 =
5 x 7 = 35
200
Round to the hundredths place value. 1.428
1.420
200
ESTIMATE the difference. 788 - 572 =
800 - 600 = 200
200
0.82 + 4.21 =
0.82 + 4.21 = 5.03
200
13.9 - 3.8 =
13.9 - 3.8 = 10.1
200
6 x 4 =
6 x 4 = 24
300
Round to the ones place value. 98.524
99.00
300
ESTIMATE the sum. 2.9 + 3.9 =
3.0 + 4.0 = 7.0
300
0.26 + 8.3 =
0.26 + 8.3 = 8.56
300
5.92 - 4.37 =
5.92 - 4.37 = 1.55
300
8 x 4 =
8 x 4 = 32
400
Round to the tens place value. 486.21
490.00
400
ESTIMATE the difference. 8.1 - 3.7 =
8.0 - 4.0 = 3.0
400
45.09 + 2.005 =
45.09 + 2.005 = 47.095
400
15.03 - 4.121 =
15.03 - 4.121 = 10.909
400
9 x 7 =
9 x 7 = 63
500
Round to the tenths place value. 1.972
2.000
500
ESTIMATE the sum. 3,856 + 2,357 =
4,000 + 2,000 = 6,000
500
356.2 + 12.45 =
356.2 + 12.45 = 368.65
500
85.22 - 43.548 =
85.22 - 43.548 = 41.672
500
9 x 9 =
9 x 9 = 81
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