Page 54 - ICSE Math 7

2. Find the product of the following.
(a) 12.65 × 10 (b) 325.65 × 100 (c) 25.003 × 1000

3. Divide the following.
(a) 243.40 ÷ 100 (b) 15.028 ÷ 10 (c) 0.4422 ÷ 0.11
4. By how much is the sum of 27.56 and 125.70 greater than their difference?

5. Divide 169 by 13 and hence find the values of the following.
(a) 16.9 ÷ 13 (b) 169 ÷ 1.3 (c) 1.69 ÷ 0.13
6. Multiply 25 by 15 and hence find the values of the following.

(a) 25 × 1.5 (b) 0.25 × 0.15 (c) 0.025 × 0.15
7. What should be subtracted from the sum of 12.579 and 3.656 to get 10.105?
8. Ram has bought three cakes of the same price for a total of ` 1,200.54. Find the price of each
cake.

9. If the cost of 4 m wire is ` 16.84, find the cost of 15 m wire.
10. Sia weighs 4.5 kg more than Raima. If their total weight is 140 kg, find Sia’s weight.
11. Round off the following numbers as indicated.
(a) 71.3567 rounded off to the nearest thousandth.
(b) 2.0461 rounded off to the nearest tenth.

(c) 9.999 rounded off to three significant figures.
(d) 12.56 rounded off to five significant figures.
12. A company pays ` 0.50 per word for writing an article. If Nisha writes an article containing 1,536
words, how much will she get paid?
13. A mini truck can be loaded with 600 kg of goods. If it is already loaded with two boxes weighing
253.75 kg and 156.90 kg, how much more weight can be loaded on the truck?

THINK SMART

1. Decimal numbers are formed by filling the empty boxes using each of the numerals from 1 to 9
exactly once.

7 2 5
.

The greatest number so formed is __________ and the smallest number formed is _________.
2. Three pieces of ropes measuring 0.2 km, 5,005 cm and 1,200 mm respectively are joined end to
end to form a single rope.
(a) How long is the new rope?

(b) Find the cost of the single rope so formed at the rate of ` 15 per metre.
3. A pole vaulter takes a huge leap in order to jump over the bar placed 9 m above the ground. In
the first attempt, he is able to reach only 7.845 m. In how many attempts will he be able to clear
the bar, if in each successive attempt he improves by 0.231 m.

40