Fraction Rules
What needs to be the same when you add and subtract fractions?
The denominator
2/3 x 4/5
8/15
1 1/2 x 5
15/2 or 7 1/2
What is the reciprocal of
11/8
8/11
Multiply straight across (multiply numerators and multiply denominators)
How do we change a whole number into a fraction?
Put a 1 in the denominator, or put it over 1.
3/5 x 7/8
21/40
5/6 x 1 1/3
10/9 or 1 1/9
3/8 -: 2/3
9/16
Find the reciprocal of 14
1/14
3 word phrase to help us with dividing fractions.
Keep - Change - Flip
4 x 7/8
7/2 or 3 1/2
4 1/2 -: 9
1/2
6 -: 5/8
48/5 or 9 3/5
Daily Double
Solve and simplify.
2/11 + 5/33
1/3
When dividing fractions, you are changing the operation into ______________________ fractions?
multiplying
It took Jason 2 5/6 hours to drive to the beach. It took Mary twice as long. How long did it take Mary to drive to the beach?
17/3 or 5 2/3
Daily Double
Joe has 7 1/2 gallons of paint. He plans on using 1 1/2 gallons in each room. How many rooms is he able to paint?
5/1 or 5 rooms
1/2 -: 5/8
4/5
Solve and simplify.
(2/3 x 4) + 1/3
3/1 or 3
What should you do first to mixed numbers when multiplying or dividing fractions?
Convert them to improper fractions.
Change them to improper fractions.
Make them improper fractionns.
2/9 x 3/8
1/12
2 2/3 x 5 1/4
14
3/8 -: 7/12
9/14
What is Mrs. Borovina's new dogs name?