Page 183 - New Medley 5 Semester 1

Mixed Problems

4 6 11
Example 8: Simplify: - +
15 25 30

(Here LCM of 15, 25 and 30 is 150)

4 6 11 4 × 10 6 × 6 11 × 5 3152530, ,
Solution: − + = − +
,
,
15 25 30 15 × 10 25 × 6 30 × 5 5 5 25 10
40 36 55 1, 5, 2
= − +
150 150 150
40 − 36 + 55 95 − 36 59
= = =
150 150 150
EXERCISE 4.3

A. Find the sum.
3 1 1 4 5 1 3
1. + 2. + 3. + +
7 7 8 8 12 12 12

3 8 17 1 1 1 2 8
4. + + 5. 2 + 3 6. 2 + 1 +
25 25 25 17 17 9 9 9
B. Add the following.

7 3 7 1 4 18
1. and 2. and 3. and
10 5 12 3 25 75
4 5 11 7 11 13 1 12
4. , and 5. , and 6. 2 and
9 12 18 15 24 40 5 25

C. Find the difference.
7 5 5 3 13 6
1. − 2. − 3. −
16 16 10 10 25 25
7 3 108 39 8 5
4. 3 − 1 5. − 6. −
40 40 70 70 14 14

D. Subtract.
1 17 8 4 2 4
1. from 2. from 3. from
4 20 27 9 3 5
7 13 1 5 17
4. from 5. 1 from 3 6. from 3
9 5 3 21 8

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