Fraction Rules
If you have two even numbers in a fraction, what is the smallest common factor you could use?
2
2/3 * -4/5
-8/15
1 1/2 * 5
15/2 or 7 1/2
What is the reciprocal of
11/8
8/11
What is the reciprocal of
2 1/3
7/3
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
5/6 * -1 1/3
-10/9 or -1 1/9
-3/8 -: -2/3
9/16
-2 1/8 -: 3
-17/24
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
5/6
-6 -: 5/8
-48/5 or -9 3/5
-1 1/8 -: -1/10
45/4 or 11 1/4
When multiplying a positive fraction by a negative fraction, will the answer be positive or negative?
negative
5/12 * 9
15/4 or 3 3/4
1 1/3 * 2 1/8
17/6 or 2 5/6
1/2 -: 5/8
4/5
3 1/4 -: 1 1/2
13/6 or 2 1/6
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 * 3/8
1/12
-2 2/3 * -5 1/4
14
3/8 -: -7/12
-9/14
3 1/2 -: 5 2/3
21/34