Adding Proper Fractions
Subtracting Proper Fractions
Adding with M.N. and Improper Fractions
Subtracting with M.N. and Improper Fractions
Other
100
3/8 + 1/8
4/8 or 1/2
100
8/15 - 4/15
4/15
100
9/5 + 6/5
15/5 or 3
100
5/3 - 4/3
1/3
100
What do you need to have in common before you can add or subtract fractions?
Denominator
200
1/2 + 1/3
5/6
200
43/60 - 16/120
70/120 or 7/12
200
2 1/2 + 5 1/2
8
200
4 1/2 - 5/4
13/4 or 3 1/4
200
In order to save a step, if you use the ______ as the common denominator, you won't need to simplify your answer.
LCM
300
12/5 + 19/20
27/20 or 1 7/20
300
5/6 - 1/4
7/12 (or 14/24)
300
27/2 + 4 3/4
73/4
300
5 3/35 - 9/7
133/35 or 3 28/35 or 3 4/5
300
When adding or subtracting mixed numbers, what must you do first?
Change them to improper fractions
400
3/7 + 12/3
177/217
400
7/9 - 2/11
59/11 or 5 4/11
400
8/7 + 4 2/11
410/77 or 5 25/77
400
8 9/16 - 2 10/13
1205/208 or 5 165/208
400
How does adding/subtracting improper fractions differ from adding/subtracting proper fractions?
It doesn't! (Trick question)
500
1/4 + 6/24 + 17/36
70/72 or 35/36
500
1/2 - 7/15 - 1/37
7/111 or 35/555
500
3/2 + 8/3 + 7 9/4
161/12 or 13 5/12
500
10 1/3 - 5 1/8 - 12/5
337/120 or 2 97/120
500
If either of the denominators is a prime number, the only way to find a common denominator is to ...
Multiply the two denominators together
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