Measurement Conversions
Number Forms
Rounding
Estimating Decimal Sums and Differences
Comparing Decimal Numbers
100

Multiply or divide to complete the measurement conversion:

The length of 4.65 meters is the same as ___________________ millimeters.  

When you are finished tell your neighbor how you got your answer.

4.65 M = 4650 mm   It takes 1000 millimeters to make a meter, so I would multiply 4.65 by 1000.  

100

Write the following number in unit form:

35.98

3 tens 5 ones 9 tenths 8 hundredths

100

Round  51.582 to the 

one

tenth

hundredth


52

51.6

51.58


100

Estimate to the nearest whole number.  Then complete the operation using the standard algorithm.  Are your estimates and answers similar? 

45.3 + 32.8 = 

Estimate:  45 + 33 = 78.0

Exact answer: 78.1 

How far apart was the estimated answer to the actual answer? 

100

5 tenths + 11 hundredths ______  0.62

0.61 < 0.62

200

Multiply or divide to complete the measurement conversion:

The length of 72 millimeters is the same as ___________________ meters.  

When you are finished tell your neighbor how you got your answer.

72 mm = .072 m  

1 millimeter is 1/1000 of a meter, so I would divide 72 by 1000 to get my answer.  72/1000 can be written as 0.072. 

200

Write the following number in expanded form:

267.41

(2x102) + (6 x 101) + (7 x 1) + (4 x 0.1) + (1 x .01) 

200

Round  89.602 to the 

one

tenth

hundredth

90

89.6

89.60 (or 89.6)

200

2.045 + 79 = 

Estimate:  2 + 79 = 81

Exact Answer: 81.045

How far apart were the estimate and exact answer? 

200

583 hundredths + 9 tenths _________ 1 + 3 tenths

1.483 > 1.3

300

Multiply or divide to complete the measurement conversion:

The length of 0.04 meters is the same as ___________________ millimeters. 

When you are finished tell your neighbor how you got your answer.

0.04 m = 40 mm  

There are 1000 millimeters in each meter, so I would multiply by 1000 to get my answer. 

300

Write the following number in standard form 

(8x1) + (3 x 1/10) + (4 x 1/100) + (2 x 1/1000) 

8.342

300

Round 3099.998 to the nearest  

one

tenth

hundredth

3100

3100.0 (or 3100)

3100.00 (or 3100)

Discuss:  Why are all these rounded numbers the same? 

300

  62.89 - 23.3=

Exact Answer: 81.045

How far apart were the extimate and exact answer?

Estimate:  63 - 23 = 40

Exact Answer: 39.59

How far apart were the estimate and exact answer?

300

three and seven hundred forty- six thousandths ________ (3 x 1) + (7 x 1/10) + (4 x 1/100) + (6 x 1/1000) 

3.746 = 3.746

400

Multiply or divide to complete the measurement conversion:

The length of 0.004 meters is the same as ___________________ centimeters. 

 When you are finished tell your neighbor how you got your answer.

0.004 m= .4 cm

There are 100 cm in a meterstick, so I would multiply the meters by 100 to find my answer in centimeters. 

400

Write the following number in word form:  

Use your number words spelling list.

5,905.76

five thousand, nine hundred five and seventy-six hundredths

400

Write a number with digits to the thousandths place in the blank space that could be the original number for the rounded numbers. (There is more than one right answer.)


ones:  23          tenths: 23.2        hundredths: 23.24

Original number is between 23.235 and 23.244


Discuss your number with a partner.  How did you make your choice? 

400

0.872 - 0.49

Estimate:  0.9 - 0.5 = 0.4

Exact Answer: 0.382

How far apart were the estimate and real answer?

400

(0.4 x 102) + (0.06 X 103) _________(0.4 x 10) + (0.06 X 102)

4 + 10 = 4 + 10

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