Fraction Rules

Multiplying Fractions

Multiplying Mixed Numbers

Dividing Fractions

Surprise

100

What is a strategy to simplify fractions? What do we use?

Use multiplication facts or divide by least common factor.

100

2/3 * 4/5

8/15

100

1 1/2 * 5

15/2 or 7 1/2

100

What is the reciprocal of

11/8

8/11

100

What are the steps for multiplying fractions?

Multiply straight across (multiply numerators and multiply denominators)

200

How do we change a whole number into a fraction?

Put a 1 in the denominator, or put it over 1.

200

3/5 * 7/8

21/40

200

5/6 * 1 1/3

10/9 or 1 1/9

200

3/8 -: 2/3

9/16

200

All fractions are also what type of problem?

Division problem

300

3 word phrase to help us with dividing fractions.

Keep - Change - Flip

300

4 * 7/8

7/2 or 3 1/2

300

3 1/3 * 1/4

5/6

300

6 -: 5/8

48/5 or 9 3/5

300

How do we convert a mixed number into a fraction?

Use the "C" method. Multiply the denominator with the whole number and add the numerator.

400

When dividing fractions, you are changing into ______________________ fractions?

multiplying

400

5/12 * 9

15/4 or 3 3/4

400

1 1/3 * 2 1/8

17/6 or 2 5/6

400

1/2 -: 5/8

4/5

400

What is the first rule in dividing fractions?

Keep fraction the same.

500

What should you do first to mixed numbers when multiplying or dividing fractions?

Convert them to improper fractions.

Change them to improper fractions.

Make them improper fractionns.

500

2/9 * 3/8

1/12

500

2 2/3 * 5 1/4

14

500

3/8 -: 7/12

9/14

500

What fraction do we flip?

the second fraction

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