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Build the Number
Place Value
Rounding
Estimating
Adding and Subtracting
1

50 + 5 + 0.2 + 0.06 + 0.006

55.266

1

What place value is the 8 in?

9,578.43

ones

1

Round the decimal to the ones: 

3.4553

3

1

Estimate using rounding:

 38.23 + 11.84

40 + 10 

50

1

43.28 + 31.45

74.73

2

50 + 0.8 + 0.03 + 0.007

50.837

2

What place value is the 2 in?

8,981.201

tenths

2

Round the decimal to the tens: 

27.35

30

2

Estimate using rounding:

6.45 + 5.88 + 5.61 + 6.03

 6 + 6 + 6 + 6 

24

2

0.724 + 6.458

7.182

3

6,000 + 500 + 90 + 2 + 0.7

6,592.7

3

What place value is the 4 in?

45.678

tens

3

Round the decimal to the hundredths: 

5.031

5.03

3

Estimate using Rounding 

152.16 - 47.89

150 - 50 

100

3

1.325 + 0.081

1.406

4

10 + 1 + 0.6 + 0.06 + 0.001

11.661

4

What place value is the 9 in?

12.379

thousandths 

4

Round the decimal to the hundredths:

 0.042

0.04

4

Estimate using rounding: 

21.946 x 4.2 

20 x 4 

80

4

148.93 - 121.36

27.57

5

10 + 2 + 0.7 + 0.07 + 0.004

12.774

5

What place value is the 8 in?

1,029,571.845

tenths

5

Round the decimal to the thousandths:

2.0591

2.059

5

Estimate using rounding: 

37.98 ÷ 11

40÷10 = 

4

5

248 - 131.48

116.52