Multiplying and dividing fractions review - PowerPoint PPT Presentation

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Multiplying and dividing fractions review

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Multiplying and dividing fractions review / 2 15 16 3 5 8 If your fractions are proper, then you can cross cancel That means you are reducing ... – PowerPoint PPT presentation

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Title: Multiplying and dividing fractions review


1
Multiplying and dividing fractions review
2
?¹5/16
If your fractions are proper, then you can cross
cancel That means you are reducing early
2
15
1
5

16
3
8
1
5
Once you have finished cross canceling, then all
you do is multiply the top numbers together, then
multiply the bottom numbers together.
8
3
1¾8/9
You have a mixed number, you have to make it
improper before you can start to cross cancel
To make a fraction improper you multiply the
denominator by the whole number, then add the
numerator
7
8
2

9
4
1
14
Once you have finished cross canceling, then all
you do is multiply the top numbers together, then
multiply the bottom numbers together.
9
You cant leave your final answer improper. You
need to divide in order to make it a mixed number
1 5/9
4
? 8/15
You have to fix fraction division questions. The
phrase that will help you to divide is copy,
change flip
4
15
1
3
Now you can cross cancel

8
5
2
1
3
Now you can multiply the top numbers together,
and multiply the bottom numbers together.
2
REMEMBER!!!!!! You cant leave your final answer
improper. You need to divide in order to make it
a mixed number
1 ½
5
2? 4
You have a mixed number, you have to make it
improper before you can start to divide
23
4

1
8
23
1

Dont forget to copy, change flip
4
8
23
None of the numbers can cross cancel, so all you
have to do is multiply the top numbers together
and the bottom numbers together
32
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