Fraction Division Opposite of Multiplication. The second fraction: Invert or Flip Called the reciprocal Definition: when the product of two numbers is.

Fraction Division

Opposite of Multiplication

The second fraction:• Invert or Flip• Called the reciprocal• Definition: when the product of two

numbers is one, also when you flip the second fraction in a fraction division problem

• Ex: 3

4make invert to

4

3

To Divide

• Flip the second number

• Multiply

15

8

3

4

5

2

4

3

5

2

Steps

• Change Whole numbers and mixed numbers to improper fractions

• Flip the second fraction (the divisor) and multiply

• Multiply numerator by numerator and denominator by denominator.

Examples

•

24

1

1

2

4

1

2

1

4

1

8

1

2

1

4

1

•

5

12

4

3

5

11

4

3

11

5

4

3

44

15

11

5

4

3

Word Problems

Commutative

• Multiplication is commutative• 3x4 = 4x3• Is division commutative?• NO!• Definition: numbers can be multiplied or

added in any order

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.

• Chocolate is first as it is being split.

• 8 containers.

3

2

3

15

2

3

3

168

1

1

1

8

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

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