Decimals | Speed Notes

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To understand the parts of one whole (i.e. a unit) we represent by a block divided into 10 eaual parts means (1/10) ^th of a unit. (Scroll down to continue …)

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Addition of Decimals: Decimalscan be added by writingthem with equal number of decimals places.Example: add 0.005,6.5 and 20.04.

Solution: Convert the given decimals as 0.005, 6.500 and 20.040. 0.005+ 6.500 + 20.040 = 26.545

Subtraction of Decimals: Decimalscan be subtracted by writingthem with equalnumber of decimalplaces.

Example: Subtract the given decimals as 5.674 and 12.500 12.500– 5.674 = 6.826

ComparingDecimals: Decimalsnumberscanbecompare The givendecimals have distinctwhole number part, so we compare wholenumber part only. The whole number part of 45.32 is greater than 35.69. Therefore, 45.32>35.69.

Using Decimals: Many dailylife problems can be solvedby converting different units of measurements such as money,length, weight, etc. in the decimal form.

Money:

100 paise = 1 Rupee

1 paise = 1/100 Rupee = 0.01 Rs. 5 paise = 5/100 Rs. = 0.05 Rs.

105 paise = 1 Rs. +5 paise = 1.05 Rs.

7 Rs. 8 paise= 7 Rs. + 0.08 Rs = 7.08 Rs.

7 Rs. 80 paise = 7 Rs. + 0.80 Rs. = 7.80 Rs.

Length:

10 mm = 1 cm

1mm = 1/10 cm = 0.1 cm 100 cm = 1 m

1 cm = 1/100 m = 0.01 m 1000 m = 1 km

1 m = 1/1000 km = 0.001km

Weight:

1000 g = 1 kg

1 g = 1/1000kg = 0.001 kg

25 g = 25/1000kg = 0.025 kg