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Addition & Subtraction
Fractions as decimals
Multiplication
Division
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100

1.23 + 8

9.23

100

1/2

.5 

100

0.07 x 4

0.28

100

43.8 / 6 =

7.3

100

For which 2 operations (addition, subtraction, multiplication, division) do you need to line up the decimal points?

Addition and Subtraction

200

62 - 48.6

13.4

200

2/4

.5

200

0.23 x 6

1.38

200

4.56 / 6 = 

0.76

200

For which operation (addition, subtraction, multiplication, division) do you need to count the number of digits after the decimal points?

Multiplication

300

9.6 + 0.18 =

9.78

300

1/4

0.25

300

3.75 x 8 =

30

300

20.3 / 7 =

2.9

300

When multiplying by a decimal, how do you know where to put the decimal point in the product?

Count the number of digits after the decimal point in the factors (question), and make sure there are the same number of digits after the decimal point in the product.

400

5.68 - 4.23 =

1.45

400

1/3

0.333333

400

8 x 6.5 =

52

400

32 / 5 = 

6.4

400

When you divide a decimal by a whole number, where do you place the decimal point in the quotient? 

Above the decimal point in the dividend.

500

11.27 + 9.4 - 4.56 =

16.11

500

1/10

0.1

500

4.2 x 1.8 =

7.56

500

33.8 / 4 = 

8.45

500

When dividing, what can you do when you have a remainder?

Add a decimal point and additional zeroes in the dividend.