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Mental Math
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Compare and Order
Rounding
100

_______ is 10 times as much as 0.7

7

100

2.56 x 104

25,600

100

Write this number in standard form.

6 x 1000 + 5 x 10 + 6 x 1/10

6,050.6

100

Compare the following numbers:

2.006 and 2.06

<

100

Round 4.7 to the nearest whole number.

5

200

______is 10 times as much as 0.56

5.6

200

6.3 x 105

630,000

200

Write eight and seven hundred forty-five thousandths as a decimal number.

8.745

200
Compare 

05.3 and 5.30

=

200

Round 18.26 to the nearest tenth

18.3

18.30

300

_______ is 10 times as much as 0.024

.24

300


0.054 divide 100

.00054

300

Write 504.907 in word form.

five hundred four and nine hundred seven thousandths

300

Order from least to greatest

3.1, 3.01, 3.002, 30.2

3.002

3.010

3.100

30.20

300

Round 205.348 to the nearest hundredth

205.35

205.350

400

Emma has 3.6 liters of lemonade. She pours it into bottles that each hold 0.36 liters.
How many times greater is the amount of lemonade in one whole liter compared to the amount in one bottle?

10 x

10 times

400


8 divide 100

.08

400

Write the number in standard form.

4 x 1 + 5 x 1/100 + 4 x 1/1000

4.054

400
Order greatest to least


56.4, 56.49, 5.64, 5.649

56.49

56.40

5.649

5.640


400

Round 0.00957 to the nearest thousandth

0.01

0.010

500

A toy car is 0.54 meters long. A real car is 5400.00 meters long.
How many times longer is the real car than the toy car?

10,000 times longer

500

Which equation below is correct?

A. 38.7 x 10= 387,000

B. 9.04 x 10= 9,040

C. 26.4 x 10= 264,000

D. 8.53 x 104 = 85,300

D

500

Write this number in expanded form.

4,005.035

4 x 1,000 + 5 x 1 + 3 x 1/100 + 5 x 1/1000

4 x 10^3 + 5 x 10^0 + 3 x 1/100 + 5 x 1/1000

500

Order from least to greatest.

0.101, 0.100, 1.01, 0.001, 1.001

0.001

0.100

0.101

1.001

1.010

500

The population of a city is 324,589.672 people. Round this number to the nearest ten thousand

320,000.000

320,000