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Mother: So, using the above concepts, we will get the total weight of the main ingredients (apples,
maida, and sugar) used in the cakes. That is,
3 1 2 7 1 2 21 6 8
Total weight of main ingredients = 1 + + = + + = + + (LCM of 4, 2, and 3 is 12.)
4 2 3 4 2 3 12 12 12

++
21 68 35 11
= = = 2 kg
12 12 12
Practice Time 2A

1. Convert the following improper fractions into mixed fractions.
29 34 83 101
(a) (b) (c) (d)
7 13 9 50
2. Convert the following mixed fractions into improper fractions.
3 1 5 2
(a) 6 (b) 11 (c) 4 (d) 7
7 7 11 9
3. Write three equivalent fractions for each of the following fractions.
(a) 3 (b) 12 (c) 11 (d) 14
4 21 14 25
4. Write an equivalent fraction of:
3 18
(a) with numerator 21. (b) with denominator 5.
7 45
36 84
(c) with numerator 3. (d) with denominator 6.
84 126
5. Which is greater?
7 21 4 11
(a) or (b) or
12 18 21 35
6. (a) Arrange the following fractions in ascending order.
6 3 11 5 3 5 1 7
(i) , , , (ii) , , ,
21 42 14 7 8 6 2 48

(b) Arrange the following fractions in descending order.
16 13 5 11 3 1 5 2
(i) , , , (ii) , , ,
21 35 14 10 18 12 16 3
7. Solve the following.
2
(a) 2 + 4 1 (b) 1 2 + 4 5 (c) 4 8 − 2 5 (d) 7 1 − 5 1 (e) 2 7 + 3 9 − 1 11
3 4 9 6 10 8 3 2 12 16 18
64 56
8. What must be subtracted from 8 to get 3 ?
102 84
9 15 11
9. What fraction must be added to the sum of 3 and 6 to make 15 ?
24 16 24
11 3
10. What fraction must be subtracted from 4 to get 2 ?
12 16
4 3
11. How much less than 7 is the sum of 2 and 1 ?
5 4
3 3
12. Sumit studies for 5 hours daily. He devotes 3 hours of his time for Science and Mathematics. How
4 5
much time does he devote for other subjects?

Mathematics-7 34