Using Models to Add and Subtract Decimals
Estimate Sums and Differences
Rounding Decimals
Adding and Subtracting Decimals
100
How many hundredths are represented by this model?
0.28
100
Estimate the sum by rounding to the nearest one.
28.23 + 11.84
38 + 12 = 51
100
Round 164.752 to the nearest hundredth.
164.75
100
0.734 + 6.458 =
7.182
200
Write an equation that matches this model.
0.24 + 0.15 = 0.39
200
Estimate the sum by rounding to the nearest one.
75.38 + 22.04
75 + 22 = 97
200
Round 986.57 to the nearest tenth.
986.6
200
1.325 - 0.081 =
1.244
300
Write the equation that goes with this model.
0.38 - 0.07 = 0.31
300
Estimate the difference by rounding to the nearest whole number.
$14.99 - $3.21
$15 - $3 = $12
300
Round 165.32 to the nearest hundred.
200
300
17 - 0.62=
16.38
400
Write an equation that matches this model.
0.2 + 0.20 + 0.2 = 0.6
400
Estimate the answer by rounding to the nearest whole number.
12.645 + 11.81 + 12.3
13 + 12 + 12 = 37
400
Round 43,120.555 to the nearest tenth.
43,120.6
400
248 - 31.48 =
216.52
500
Write the equation that goes with this model. 
1. 48 - 0.83 = 0.65
500
Estimate the answer by rounding your answer to the tenth.
0.251 + (0.784 - 0.229)
0.3 +(0.8 - 0.2) =
0.3 + (0.6) = 0.9
500
Round 1,249.711 to the nearest whole number.
1,250
500
Kash is 52.25 inches tall. His little sister is 24.5 inches tall. How much taller is Kash than his sister?
27.75 inches