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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

Grade 5 - Mathematics
5.17 Adding/Subtracting Fractions with Unlike Denominators

Method:
  1. To add or subtract fractions with different/unlike denominators, you must first make the denominators common.
  2. Denominators are made common by finding the LCM.
  3. Performthe required operation on like fractions so obtained.
Example: 1/2 - 1/6
Find LCM of 2 and 6 which is 6.
Multiply and divide each fraction by the LCM.
1/2 * 6/6 = 3/6
1/6 * 6/6 = 1/6
3/6 - 1/6 = 2/6
Answer: 2/6

Example: 1/2 + 1/5
Find LCM of 2 and 5 which is 10.
Multiply and divide each fraction by the LCM.
1/2 * 10/10 = 5/10
1/5 * 10/10 = 2/10
5/10 + 2/10 = 7/10
Answer: 7/10


Directions: Add/subtract the following fractions. Also write at least 5 examples of your own.
Q 1: 4/5 - 2/3 =
3/15
2/22
4/15
2/15

Q 2: 2/3 - 1/2 =
1/3
1/5
1/6
1/2

Q 3: 7/8 - 1/4 =
1/2
7/8
2/3
5/8

Q 4: 1/2 - 1/3 =
1/6
1/3
3/6
2/6

Q 5: 5/8 - 1/2 =
2/8
1/5
1/4
1/8

Q 6: 7/12 - 2/6 =
1/4
1/5
2/12
1/3

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Question 8: This question is available to subscribers only!


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