Transcript Multiplying rational numbers

Multiplying and
dividing fractions
review
If your fractions are proper,
then you can cross cancel
That means you are
reducing early
⅔•¹⁵/₁₆
1
Once you have
finished cross
canceling, then all you
do is multiply the top
numbers together,
then multiply the
bottom numbers
together.
1
2 • 15
3 16
5
8
5
8
You have a mixed number,
you have to make it
improper before you can
start to cross cancel
Once you have
finished cross
canceling, then all you
do is multiply the top
numbers together,
then multiply the
bottom numbers
together.
To make a fraction
improper you multiply the
denominator by the whole
number, then add the
numerator
1¾•⁸/₉
1
7 •8
4 9
14
9
1 ⁵/₉
2
You can’t leave your
final answer improper.
You need to divide in
order to make it a mixed
number
You have to fix fraction division questions. The phrase that will help you to divide is
copy, change flip
⅘ ÷ ⁸/₁₅
Now you can cross cancel
Now you can multiply
the top numbers
together, and multiply
the bottom numbers
together.
1
1
4 • 15
5 8
3
2
1½
3
2
REMEMBER!!!!!!
You can’t leave your
final answer improper.
You need to divide in
order to make it a mixed
number
You have a mixed number,
you have to make it
improper before you can
start to divide
Don’t forget to copy, change flip
None of the numbers
can cross cancel, so
all you have to do is
multiply the top
numbers together and
the bottom numbers
together
2⅞ ÷ 4
23 • 1
8 4
23
32
23
8
÷
4
1