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MEAP Preparation - Grade 7 Mathematics
1.86 Addition and Subtraction of Mixed Fractions with Unlike Denominators

Method:
  1. Add or subtract the whole numbers
  2. Add the fractional part
Example: 1 1/2 + 3 3/4
  1. Add the whole numbers 1 and 3 which gives 4.
  2. Add the fractional part, 1/2 + 3/4
  3. LCM of 2 and 4 is 4.
  4. 1/2 x 4/4 = 2/4
  5. 3/4 x 4/4 = 3/4
  6. Add the fractions 2/4 + 3/4 = 5/4
Answer: 4 5/4

Example: 7 1/2 - 3 1/4

  1. Subtract the whole numbers (7-3) which gives 4.
  2. Subtract the fractional part.
  3. 1/2 - 3/4
  4. LCM of 2 and 4 is 4.
  5. 1/2 x 4/4 = 2/4
  6. 1/4 x 4/4 = 1/4
  7. (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.

Name: ___________________

Date:___________________

MEAP Preparation - Grade 7 Mathematics
1.86 Addition and Subtraction of Mixed Fractions with Unlike Denominators

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

Q 2: 2 3/9 + 1 1/3 =
3 2/3
1 4/9
3 4/9

Q 3: 6/12 + 1/4 =
3/4
7/12
2/4

Q 4: 8 2/5 + 7 1/3 =
15 3/5
15 3/10
15 11/15

Q 5: 9 5/7 + 6 1/2 =
16 3/14
15 17/14
15 6/7

Q 6: 5 1/2 - 3 2/5 =
2 1/5
2 1/10
2 5/10

Q 7: 10 3/4 - 5 3/5 =
5 0/5
5 3/20
5 6/20

Q 8: 7 3/7 - 2 2/3 =
4 16/21
5 1/7
5 1/21

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Question 10: This question is available to subscribers only!


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