Chapter 4-2, 4-3 and 4-4: Multiply Fractions, Whole Numbers and Mixed Numbers
MULTIPLYING
FRACTIONS:
First see if you
can SIMPLIFY ... some call it CROSS CANCEL:
Does the numerator
of one fraction go into the denominator of the other (or vice versa)?
If so take this
OPPORTUNITY to make the math easier and simplify before multiplying.
Next, multiply the
numerators and multiply the denominators.
Simplify: Make any
improper fractions into mixed numbers.
When it’s a whole
number, we usually put the number over 1, but you don’t have to.
What’s the danger
of missing a cross cancelling opportunity?
You’ll just have
to simplify more at the end!
Multiply Mixed
Numbers
Restate mixed
numbers into improper fractions
Then multiply the
usual way as above
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