Estimating Place Value
Sum of Decimals
Difference of Decimals
Estimating Equations
Using Models to Solve Equations
100

Round 12.36 to the nearest tenth

12.4

100

Solve. 

4.7 + 8.3

13 

100

13.4 - 1.7

11.7

100

Estimate the sum.

412 + 565

1,000 or 980

100

Find the perimeter of this shape.

260.068 cm

200

Round 4,324.235 to the nearest hundreds place.

4,300.000 or 4,300

200

Solve. 

12.1 + 14.02

26.12

200

5,500.12 - 2.89

5,497.23

200

Estimate the sum to the nearest tenth.

0.44 + 1.74

2.10

(IT IS NOT 2.20)

200

Estimate the perimeter of this rectangle to the nearest tenth.

54.4 inches

300

Round 55,999.34 to the nearest thousands place.

56,000.00 or 56,000

300

Solve. 

10.004 + 1.308 + 4

15.312

300

402.17 - 10.82

391.35

300

Estimate the sum to the nearest hundredth.

14.312 + 2.333 + 2.179

18.82

300

Write an equation to show the sum.

1 + 0.13 + 0.20 = 1.33

or 

1.13 +  0.20 = 1.33

400
Round 412.1567 to the nearest hundredths place.

412.1600 or 412.16

400

Solve. 

40.799 + 500.090 + 1

541.889

400

1,000.400 - 29

971.4

400

Estimate the sum to the nearest whole number.

4.99 + 13.018 + 0.9

19

400

Write an equation that show the difference.

2.56 - 0.33 = 2.23

500

Round 11.689 to the nearest whole number.

12 or 12.000

500

0.129 + 501.73 + 42.003

543.862

500

  7,312.59

-     5.306

7,307.284

500

Estimate the sum to the nearest whole number.

10.64 + 102.639 + 0.49

114

500

Write an equation to show the sum.

0.72 + 0.28 + 0.06 = 1.06

or 

0.72 + 0.34 = 1.06