Fraction Rules
I need a common denominator when __________ and ____________ fractions
adding and subtracting
2/3 * 4/5
8/15
(1/2 + 1/2) * 23
23
What is the reciprocal of
11/8
8/11
Wendy has 3 pizzas and divides each one into 1/4's. How many pieces of pizza does she have?
16 Pieces
How do we change a whole number into a fraction?
Put a 1 in the denominator, or put it over 1.
3/5 * 7/8
21/40
(4/5 - 3/5) * 7
7/5 or 1 2/5
3/8 -: 2/3
9/16
Sandy had 56 cookies. 1/7 of them are oatmeal raisin. How many cookies are oatmeal raisin?
8 cookies are oatmeal raisin
3 word phrase to help us with dividing fractions.
Keep - Change- Flip
4 * 7/8
7/2 or 3 1/2
(3 1/3 + 1/4) - 3
7/12
6 -: 5/8
48/5 or 9 3/5
Bob has 35 fish. 3/5 of the fish are goldfish. How many fish are NOT goldfish?
14 fish are not goldfish
I do NOT need a common denominator when ______________ and ______________ fractions.
multiplying and dividing
5/12 * 9
15/4 or 3 3/4
Write then solve:
1/5 the sum of 7 and 23
6
1/2 -: 6
1/12
Mrs. Murgillo needs 1 1/3 yards of fabric for a blanket. The store only sells fabric in feet. How many feet does she need?
4 feet
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 2/3 * 5 1/4
14
Write then solve:
2/7 the difference of 30 and 2
8
3/8 -: 7/12
9/14
Ms. Hill makes cupcakes. 1/3 of the cupcakes are vanilla. The rest are chocolate. She puts sprinkles on a half of the chocolate cupcakes. What fraction of the cupcakes are chocolate with sprinkles?
2/6 or 1/3 of the cupcakes are chocolate with sprinkles