1. Adding and Subtracting Fractions Review

2. Once you have a common denominator, then add!
ADDING FRACTIONS
When adding fractions you MUST have a common denominator!
Find the smallest number that both 4and 5 will go into. This number is 20. Then multiply both the numerator and denominator to get to 20. 3 4
1 5_ + x
5 = 15 20 = 19 20
Once you have a common denominator, then add!
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3. SUBTRACTING FRACTIONS
QUIZ
SUBTRACTING FRACTIONS 5 6 2 3 X 1 2 5 6 4
Find the least common multiple for 3 and 6. (In this case, 6) Then multiply! 1 6
This is your answer!
To subtract fractions you must have a common denominator!
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4. We need a common
denominator to add
these fractions. +

5. +
We need a common
denominator to add
these fractions.
Count by 7's
7, 14, 21, 28, 35, 42, 49, 56, 63
Count by 5's
5, 10, 15, 20, 25, 30, 35, 40, 45

6. We need a common
denominator to add
these fractions. +
Count by 7's
7, 14, 21, 28, 35, 42, 49, 56, 63
Count by 8's
8, 16, 24, 32, 40, 48, 56, 64, 72

7. +
We need a common
denominator to add
these fractions.
Count by 3's
3, 6, 9, 12, 15, 18, 21, 24, 27
Count by 5's
5, 10, 15, 20, 25, 30, 35, 40, 45

8. +
We need a common
denominator to add
these fractions.
Count by 3's
3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33
Count by 11's
11, 22, 33, 44, 55, 66, 77…

9. +
We need a common
denominator to add
these fractions.
Count by 3's
3, 6, 9, 12, 15, 18, 21, 24, 27
Count by 6's
6, 12, 18, 24,…

10. -
We need a common
denominator to
subtract one fraction
from another.
Count by 2's
2, 4, 6, 8, 10, 12, 14, 16, 18, 20 …
Count by 10's
10, 20, 30…

11. 5 3 2 5 – 3 = 2 = - = x 5 x 5 x 1 x 1 Make equivalent fractions.
Subtract. - =
5 – 3 = 2
x 1 2

12. Try These A D E B F C