Page 49 - Math 4

Fundamental Operations Fundamental Operations

e) 1 kg = 1000 gm, 9 kg = × =

f) 1 l = 1000 ml, 7 l = × =

g) 1 hour = 60 minutes, 3 hours = × =
h) 1 minute = 60 seconds, 4 minutes = × =
7. Let's jump forward as many steps and as many times as to match the
sums. Then, find the products.

a)

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
6 times 3 = 6 × 3 =
b)

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

times = × =
c)

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
times = × =
Section B
Let's rewrite these sums and calculate the products.

8. a) 8 × 20 b) 80 × 20 c) 70 × 30 d) 70 × 300 e) 600 × 40

f) 110 × 10 g) 110 × 200 h) 120 × 50 i) 150 × 30 j) 240 × 20

9. a) 24 × 8 b) 46 × 7 c) 85 × 9 d) 18 × 12

e) 36 × 25 f) 54 × 37 g) 92 × 44 h) 116 × 15

i) 225 × 27 j) 408 × 32 k) 560 × 56 l) 2375 × 236

Let's read these problems carefully and solve them.

10. a) The cost of 1 kg of apples is Rs 125. Find the cost of 10 kg of apples.

b) The cost of 1 l of petrol is Rs 108. Find the cost of 15 l of petrol.

c) The cost of a gas cylinder is Rs 1425. Find the cost of 4 gas cylinders.

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vedanta Excel in Mathematics - Book 4
Approved by Curriculum Development Centre, Sanothimi, Bhaktapur v edanta Ex c e l in Mathematics - Book 4