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Makes use of of Decimals | Decimals In Each day Life


We
will study makes use of decimals in daily. In each day life we use decimals whereas
coping with size, weight, quantity, cash and many others.

 

Use of Decimals whereas Coping with Cash:

100 paise = 1 rupee;

                   [We know that one paise in one hundredth of a rupee.]

1 paise = (frac{1}{100}) rupee = 0.01 rupee

9 paise = (frac{9}{100}) rupee = 0.09 rupee

21 paise = (frac{21}{100}) rupee = 0.21 rupee

Thus, 8 rupees 15 paise = 8(frac{15}{100}) = 8.15 rupees

10 rupees 5 paise = 10(frac{5}{100}) = 10.05 rupees

We learn 6.45 rupees as six rupees 45 paise

16.25 rupees as sixteen rupees 25 paise


Use of Decimals whereas Coping with Lengths:

10 mm = 1 cm

Subsequently, 1 mm = (frac{1}{10}) cm = 0.1 cm;

                                   [One millimetre is one tenth of a centimetre.]

Subsequently, 9 mm = (frac{9}{10}) cm = 0.9 cm

Thus, 4 cm 8 mm = 4(frac{8}{10}) cm = 4.8 cm

13 cm 6 mm = 13(frac{6}{10}) cm = 13.6 cm

We all know that 100 cm = 1 m;

                                [One centimetre is one hundredth of a metre.]

1 cm = (frac{1}{100}) m = 0.01 m

2 cm = (frac{2}{100}) m = 0.02 m

10 cm = (frac{10}{100}) m = 0.10 m or 0.1 m

89 cm = (frac{89}{100}) m = 0.89 m

Thus, 4 m 56 cm = 4(frac{56}{100}) m = 4.56 m

18 m 8 cm = 18(frac{8}{100}) m = 18.08 m

1000 m = 1 km

Subsequently, 1 m = (frac{1}{1000}) km = 0.001 m;

                                 [One metre is one thousandth of a kilometre.]

Subsequently, 8 m = (frac{8}{1000}) km = 0.008 km

18 m = (frac{18}{1000}) km = 0.018 km

356 m = (frac{356}{1000}) km = 0.356 km

Thus, 9 km 426 m = 9(frac{426}{1000}) km = 9.426 km

25 km 693 m = 25(frac{693}{1000}) km = 25.693 km

 

 

Use of Decimals whereas Coping with Weights:

1000 g = 1 kg

1 g = (frac{1}{1000}) kg = 0.001 kg;

                                 [One gram is one thousandth of a kilogram.]

For examples:

5 g = (frac{5}{1000}) kg = 0.005 kg

49 g = (frac{49}{1000}) kg = 0.049 kg

365 g = (frac{365}{1000}) kg = 0.365 kg

Thus, 7 kg 118 g = 7(frac{118}{1000}) kg

                          = 7.118 kg

20 kg 48 g = 20(frac{48}{1000}) kg

                = 20.048 kg

Use of Decimals whereas Coping with Volumes:

1000 ml = 1 l

1 ml = (frac{1}{1000}) l = 0.001 l;

                                 [One millilitre is one thousandth of a litre.]

For examples:

6 ml = (frac{6}{1000}) l = 0.006 l

28 ml = (frac{28}{1000}) l = 0.028 l

146 ml = (frac{146}{1000}) l = 0.146 l

Thus, 5 l 450 ml = 5(frac{450}{1000}) l

                         = 5.450 l

19 l 32 ml = 19(frac{32}{1000}) l

                = 19.032 l

Questions and Solutions on Makes use of of Decimals:

1. Write in decimals. (One has been performed for you):

(i) 21 rupees 55 paise 21.55 rupees

(ii) 250 rupees 5 paise → ………………..

(iii) 3 cm 99 mm → ………………..

(iv) 4 km 314 mm → ………………..

(v) 17 kg 50 g → ………………..

(vi) 3 rupees 10 paise → ………………..

(vii) 12 m 32 cm → ………………..

(viii) 20 m 8 cm → ………………..

(ix) 26 km 19 m → ………………..

(x) 10 l 70 ml ………………..

4th Grade Math Actions

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