Page 106 - Revised Maths Wisdom Class - 3

104 MATHS

4
Example 2: Add , 2 , 1 Example 3: Subtract 4 from 9 .
9 9 9 10 10

Solution: Here, denominators are 9 4 9 – 4 5
same for all fractions. Solution: 10 – 10 = 10 = 10

Therefore, 4 + 2 + 1
9 9 9

= 4 + 2 + 1 = 7
9 9

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Remember!emember!emember!
Sum of numerators
 Sum of two or more like fractions = Common denominator

Diff erence of numerators
 Diff erence of two like fractions =
Common denominator

Exercise 7D

1 Do the following additions.

1 1 1 3 2
(a) + = (b) + + =
4 4 6 6 6

1 3 1 2 3
(c) + = (d) + + =
9 9 11 11 11

1 2 5 1 1
(e) + = (f) + + =
5 5 8 8 8

2 Do the following subtractions.

1
1
(a) 3 − = (b) 2 − =
4 4 5 5

3 2 5 4
(c) − = (d) − =
8 8 8 8

1
(e) 6 − 3 = (f) 5 − =
7 7 7 7