Transcript Multiplying & Dividing Fractions

 Reciprocal
 Multiplying Fractions
 Dividing Fractions
QUIZ: Multiplying
Fractions
QUIZ: Dividing
Fractions
Change any mixed numbers into improper fractions.
Change any whole numbers into improper fractions
by putting 1 under the whole number.
Cross cancel wherever possible.
Multiply horizontally.
Reduce if necessary.
EXAMPLES
To find the reciprocal of a fractions, flip it!
You need the reciprocal when dividing fractions!
EXAMPLES:
2
3
3
2
2½
=
5
2
2
5
Change any mixed numbers into improper fractions.
Change any whole numbers into improper fractions by
putting 1 under the whole number.
KEEP – SWITCH - FLIP
Cross cancel wherever possible.
Multiply horizontally.
Reduce if necessary.
EXAMPLES
Examples of multiplying fractions
3
Another
Example
8
X
4
1
1
3
9
8
X
4
1
1
9
X
2
3
2
1 X 2 = 2
3
1 X 3 = 3
Examples of multiplying fractions
2½
X
¼
5
2
X
1
5
4
8
Examples of dividing fractions
5
10
9
12
Another
Example
FLIP
SWITCH
KEEP
1
5
3
9
X
12
4
1
10
2
3
x
4
4
2
2
6
3
Examples of dividing fractions
3 ½
2 ¼
7
9
2
4
FLIP
SWITCH
KEEP
7
2
x
4
9
28
18
1
10
18
1
5
9
CHECK
ANSWERS
Back to Quiz
1.
6 divided by 3 ½ =
2.
4/5 divided by 2/5 =
3.
1 ½ divided by 3 ¾ =
4.
3 ½ divided by 1 ¾ =
5.
2 ½ divided by 2 ½ =
6.
5 1/3 divided by 4/9 =
Check your
answers
1.
6 divided by 3 ½ = 1 5/7
2.
4/5 divided by 2/5 = 2
3.
1 ½ divided by 3 ¾ = 2/5
4.
3 ½ divided by 1 ¾ = 2
5.
2 ½ divided by 2 ½ = 1
6.
5 1/3 divided by 4/9 = 12
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Quiz