S.chand publication New Learning Composite mathematics solution of class 7 Chapter 2 Fractions and Decimals Exercise 2K

 Exercise 2K

Question 1

Divide

(a) 29.6 ÷ 3.7

$=\frac{296}{37}$

=8

(b) 0.377 ÷ 2.9

$=\frac{377}{2900}$

=0.13

(c) 42.3 ÷ 0.12

$=\frac{4230}{12}$

=352.5

(d) 9.375 ÷ 0.75

$=\frac{9375}{750}$

=12.5

Question 2

(a) 16 ÷ 0.0004

$=\frac{160000}{0.0004}$

=40000

(b) 1 ÷ 0064

$=\frac{10000}{0.0064}$

=156.25

(c) 396 ÷ 0.00375

$=\frac{39600000}{0.00375}$

=105600

Question 3

(a) 0.000133 ÷ 8.75

Sol :

$=\frac{0.000133}{8.750000}$

=0.0000152

(b) 0.03 ÷ 0.0008

Sol :

$=\frac{0.03}{0.008}=\frac{0.0300}{0.0008}$

=37.5

(c) 0.00217 ÷ 12.4

Sol :

$=\frac{0.00217}{12.40000}$

=0.000175

Question 4

Evaluate correct to 3 places of decimals.

(a) 4.13 ÷ 7.04

Sol :

$=\frac{413}{704}$

=0.587

(b) 0.67 ÷ 5.08

Sol :

$=\frac{0.67}{5.08}$

=0.132

(c) 5.872 ÷ 291.4

Sol :

$=\frac{5.872}{291.4}$

=0.020

Question 5

(a) $\frac{8}{13}$

Sol : 0.615

(b) $\frac{12}{19}$

Sol : 0.632

(c) $\frac{9}{65}$

Sol : 0.138

(d) $\frac{80}{97}$

Sol : 0.825