Page 97 - ICSE Math 6

Now, perform 19.595 – 6.769 to get:
19.595
– 06.769

12.826

Thus, 19.586 + 0.009 – 4.719 – 2.05 = 12.826
Example 10: Simplify 6.77 – 22.105 + 7.5 + 5.522

Solution: After converting to like decimals, As, 22.105 > 19.792, therefore
add all the positive numbers we subtract 19.792 from 22.105
to get: to get:
6.770 22.105
7.500 – 19.792
+ 5.522 02.313

19.792
∴ 6.77 – 22.105 + 7.5 + 5.522 = 19.792 – 22.105
= –(22.105 – 19.792) = –2.313

Use of Decimals
In currency

Our country’s currency is Rupee which is written as `.
1 Rupee = 100 paise
So, when a rupee is divided into hundred equal parts, each part is called a paisa (p). We can use decimal
system to represent Rupees and Paise together.
For example: (a) ` 24 and 50 paise = ` 24.50

(b) ` 2 and 9 paise = ` 2.09
(c) 65 paise = ` 0.65

To measure lengths
The standard unit for measuring length is metre (m). Maths Info
1 m = 100 cm 10 mm = 1 cm
10 cm = 1 dm
When a length of one metre is divided into hundred equal parts, then 10 dm = 1 m
each part is called a centimetre (cm). For measuring smaller lengths, 10 m = 1 dam
we use decimetre (dm), millimetre (mm), etc., and for measuring bigger 10 dam = 1 hm
10 hm = 1 km
lengths, we use decametre (dam), hectometre (hm), kilometre (km), etc. 100 cm = 1 m
We can use decimal system to represent a combination of any two 1,000 m = 1 km
units of length together.
For example: (a) 10 m and 14 cm = 10.14 m

(b) 9 m and 9 cm = 9.09 m
(c) 51 cm = 0.51 m

To measure weights
The commonly used unit for measuring weight (mass) is kilogram (kg).
1 kg = 1,000 g

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