Page 100 - ICSE Math 6

5. Simplify.

(a) 2.9 + 5.65 – 3.651 (b) 1.952 + 22.5 – 21
(c) 200.9 – 50.55 – 101.99 (d) 7.8 – 9.5 – 1.56 + 20
(e) 5.63 – 8.86 + 19.5 – 22.66 (f) 3.7 + 7.42 – 11.55

6. Tanvi bought a book for ` 43.65. She gave ` 50 to the shopkeeper. How much money did she get
back from the shopkeeper?
7. 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 those three weeks?
8. 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.

AT A GLANCE

¾ Fractions having 10 or higher power of 10 as the denominator are known as decimal fractions.
¾ Decimals having equal number of decimal places are known as like decimals, otherwise they
are unlike decimals.
¾ Decimals which are equal to the same fraction are known as equivalent decimals.
¾ While performing addition and subtraction on decimals, we convert the decimals into like
decimals first.

MENTAL MATHS

1. Fill in the boxes with ‘>’, ‘<’ or ‘=’.
(a) 73.216 37.999 (b) 0.01 0.1 (c) 15.50 15.5

(d) 21.5 22 (e) 45.28 45.278 (f) 0.9 0.90
2. Determine whether the given decimals are like, unlike or equivalent.

(a) 7.11 and 18.6 (b) 9.51 and 2.91 (c) 1.9 and 11.9
(d) 1.6 and 1.600 (e) 24.5 and 2.45 (f) 0.61 and 0.610

3. Fill in the blanks.
(a) ` 19 and 21 paise = ` __________ (b) ` 3 and 8 paise = ` __________

(c) 2 m and 25 cm = __________ m (d) 5 m and 8 cm = __________ m
(e) 65 kg and 5 g = __________ kg (f) 16 kg and 25 g = __________ kg

PRACTICE TIME

1. Write the decimal equivalent of the following expressions.

(a) 9×10 5×1 2×+ + 1 + 5× 1 (b) 5× 1 +× 1
7
10 1000 10 1000
1 1 1 1 1
(c) 5×100 2×1 6×+ + + 7× + 9× (d) 4×100 8×+ + 9×
10 100 1000 100 1000

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