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Grade 5 - Mathematics
5.26 Addition and Subtraction of Mixed Fractions with Unlike Denominators
Method:
Add or subtract the whole numbers
Add the fractional part
Example
: 1 1/2 + 3 3/4
Add the whole numbers 1 and 3 which gives 4.
Add the fractional part, 1/2 + 3/4
LCM of 2 and 4 is 4.
1/2 x 4/4 = 2/4
3/4 x 4/4 = 3/4
Add the fractions 2/4 + 3/4 = 5/4
Answer: 4 5/4
Example
: 7 1/2 - 3 1/4
Subtract the whole numbers (7-3) which gives 4.
Subtract the fractional part.
1/2 - 3/4
LCM of 2 and 4 is 4.
1/2 x 4/4 = 2/4
1/4 x 4/4 = 1/4
(2-1)/4 = 1/4
Answer: 4 1/4
Directions:
Add or subtract the following mixed fractions. Also write at least ten examples of your own.
Q 1
: 9 1/4 + 2 1/2 =
11 3/4
11 1/3
12 3/4
Q 2
: 7 3/7 - 2 2/3 =
5 1/21
5 1/7
4 16/21
Q 3
: 3 1/8 + 4 2/4 =
1 3/4
7 3/8
7 5/8
Q 4
: 9 5/7 + 6 1/2 =
15 17/14
16 3/14
15 6/7
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