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QUESTION QUESTION #2#2

7.2 A Multiplying & Dividing Fractions/Mixed Numbers

• To + and – fractions must always have a common denominator

*But x or ÷ fractions the denominator does NOT change

multiply numerators (straight across)

multiply denominators (straight across)

Example:

13

25

X = 1 x 23 x 5

= 215

31

X 14 == 3 x 1

1 x 434

Mixed Numbers:

13

23

X

13

X 83 = 8

9

2Need to make an improper fraction then multiply

Improper Fraction – bigger numerator than denominator

When Dividing:

• If dividing fractions make the second fraction a reciprocal (flip the #) and multiply

13

÷ 25 = 1

3X 5

2reciprocal

= 56

Dividing Mixed Numbers:

14

÷ 13 = 1

473 =

328

2 ÷

14

X 37 =

Using pictures