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Adding / Subtracting Decimals

100

2.5 + 6.45

8.95

200

8.45-4.3

4.15

300

12.0 - 4.5

7.5

400

96.36 + 12.56

108.92

500

15.79 - 4.63

11.16

Multiplying / Dividing Decimals Rules

100

What is the rule for multiplying decimals?

count ALL the numbers AFTER the decimal, then multiply like normal

200

What is the rule for dividing decimals with a whole number?

move the decimal straight up, and divide like normal

300

What is the rule for dividing decimals by decimals 

move the decimal in the divisor till you can't move no more! do the same to the divided. move it straight up, then divide like normal

400

What is the divisor?

number outside

500

What is the divided?

number inside

Adding / Subtracting Fractions with Like Denominators

100

1/4 + 2/4 =

3/4

200

3/8 + 5/8 = 

8/8 = 1

300

2/5 + 4/5 =

6/5

400

12/16 - 4/16

8/16 = 1/2

500

15/30 - 5/30 = 

10/30 = 1/3

Adding Fractions with Unlike Denominators

100

2/5 + 5/6 = 

37 / 30

200

2/5 + 5/9 = 

43/45

300

1/6 + 3/4 =

22/24

400

5/8 + 1/2 =

18/16

500

3/7 + 3/5 =

36/35

Multiplying / Dividing Fractions

100

3/4 x 4/5 =

12/20

200

2/5 x 3/5 =

6/25

300

3/4 x 1/2 = 

3/8

400

1/3 ÷ 2/3

1/2

500

4/5 ÷ 1/2

8/5 or 1 3/5