Fraction Rules
What step is used to simplify fractions when multiplying or dividing?
Divide by a common factor
2/3 * 4/5
8/15
1 1/2 * 5
7 1/2
What is the reciprocal of
11/8
8/11
Length of 3 feet
Width of 10 feet
Height of 15 feet
450 feet cubed
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
3 2/5 * 1/7
1/2
1/8 -: 3
1/24
Length of 2/5 meters
Width of 5 meters
Height of 7 1/2 meters
45 meters cubed
Do we use reciprocals when multiplying OR dividing fractions?
Dividing Fractions
2 x 2/68
1/17
1 1/3 * 1 1/4
1 2/3
6 -: 1/8
48
What is the formula for finding area of a rectangular prism?
b x h or
L x W x H
When multiplying mixed numbers, what two strategies could you use?
Area Model and Making Improper Fractions
5/12 * 9
15/4 or 3 3/4
2 1/3 * 5 1/4
12 1/4
1/2 -: 5
1/10
Write your own fraction multiplication problem that shows Cross Simplification.
Answers may vary.
2/9 * 3/8
1/12
2 2/3 * 1/4
2/3
1/12 -: 3
1/36