Page 175 - Start Up Mathematics_6

6. What should be added to 123.409 to get 140?

7. What should be subtracted from 67 to get 56.65?
8. Which is greater?
(a) 23.880 or 23.088 (b) 10.77 or 10.099

9. Evaluate the following:
(a) 456.345 + 274.76 + 897.098 (b) 234.432 + 507.834 – 178.344
10. Subtract the following:

(a) 1,789.678 – 1,213.436 (b) 65.008 – 36.236
11. The maximum temperature of Bhopal city was recorded as 48.6°C and the minimum
temperature was recorded as 29.9°C. What is the difference in temperature?
12. Find the difference between:
(a) 15 m 8 cm and 12 m 15 cm (b) 23 kg 200 g and 17 kg 500 g

Thinking Skills
1
1. Can a fraction be written as a decimal? Why can be easily converted into decimal as
1 5
compared to ?
3
2. Decimals are used to represent a ‘part of a whole’. Hence, their value should always be less
than 1. Why it is not so? Explain.

1 1
3. Identify and place the following decimals into four groups: I—less than ; II—between
2 2 3 3 4 4
and ; III—between and ; IV—more than 4
4
5
5
(a) 0.249 (b) 0.3902 (c) 0.475 (d) 0.0025
(e) 0.8009 (f) 0.1023 (g) 0.3942 (h) 1.0007
4. Round off 3.561 to the nearest: (a) unit (b) tenth (c) hundredth
5. Some digits in the following number are covered by squares:

2 4 . 8
If no digit in the number is to be repeated, determine:
(a) the greatest possible number (b) the least possible number

Values and Life Skills

1. A brother and a sister are 1.64 m and 98 cm tall respectively. What is the difference between
their heights in metres and in centimetres separately? What type of diet should you take to
increase your height?
2. In Srinagar, snowfall in the three weeks of winter season was recorded as 10.67 cm, 11.34 cm
and 9.78 cm. What is the total snowfall in the season? What precautions one should take
while going to a hill station?
3. The weight of a cylinder filled with gas is 28 kg. If the weight of the empty cylinder is
13 kg 600 g, find the weight of the gas contained in it. Why no other heating device should
be placed near a gas cylinder?

167