Class 7 Maths Chapter 2 Fractions and Decimals Exercise 2.7 pdf notes:-

**Exercise 2.7** Class 7 maths Chapter 2 Pdf Notes:-

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## Ncert Solution for Class 7 Maths Chapter 2 Fractions and decimals Exercise 2.7 Tips:-

**DIVISION OF DECIMAL NUMBERS**

Savita was preparing a design to decorate her classroom. She needed a few coloured

strips of paper of length 1.9 cm each. She had a strip of coloured paper of length 9.5 cm

Take 31.5 Ć· 10 = 3.15. In 31.5 and 3.15, the digits are

same i.e., 3, 1, and 5 but the decimal point has shifted in the

quotient. To which side and by how many digits? The decimal

point has shifted to the left by one place. Note that 10 has one

zero over 1.

Consider now 31.5 Ć· 100 = 0.315. In 31.5 and 0.315 the

digits are same, but what about the decimal point in the quotient?

It has shifted to the left by two places. Note that 100 has two zeros over1.

So we can say that, while dividing a number by 10, 100 or 1000, the digits of the

number and the quotient are same but the decimal point in the quotient shifts to the

left by as many places as there are zeros over 1. Using this observation let us now

quickly find: 2.38 Ć· 10 = 0.238, 2.38 Ć· 100 = 0.0238, 2.38 Ć· 1000 = 0.00238

Or, let us first divide 64 by 2. We get 32. There is one digit to the right of the decimal

point in 6.4. Place the decimal in 32 such that there would be one digit to its

right. We get 3.2 again.

To find 19.5 Ć· 5, first find 195 Ć·5. We get 39. There is one digit to the

right of the decimal point in 19.5. Place the decimal point in 39 such that there

would be one digit to its righ