03 frac div

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Fraction Division

Opposite of Multiplication

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The opposite number:

• Invert• Called the reciprocal•

34make invert to

43

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To Divide

• Invert the second number

• Multiply

158

34

52

43

52

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Steps

• Change Whole numbers and mixed numbers to improper fractions

• Invert the second fraction (the divisor) and multiply

• Cancel if you can• Multiply numerator by numerator and

denominator by denominator.

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Examples

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•

241

12

41

21

41

81

21

41

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•

512

43

511

43

115

43

4415

115

43

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Word Problems

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Commutative

• Multiplication is commutative• 3x4 = 4x3• Is division commutative?• NO!

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Division

• The order matters• When working word problems, be careful

what order you write the problem.• The thing being split, cut, sorted, shared,

divided, or grouped goes first.• How many pieces or how big goes second.

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• Chocolate is first as it is split.• Total divided by How Big is How Many.

• 8 containers.

32

315

23

316 8

11

18

Fran puts 5 1/3 lbs of chocolate in 2/3 lb containers. How many containers?

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03 frac div

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