SChand Composite Mathematics Class 7 Chapter 3 Decimals Exercise 3B

 Exercise 3B


Q1 | Ex-3B |Class 7 | Decimals | S.Chand | Composite Mathematics | Chapter 3 | myhelper


Question 1

(i) 8.37×10

=83.7


(ii) 4.6×10

=46


(iii) 49.87×100

=4987


(iv) 4.907×10

=49.07


(v) 0.0000078×1000

=0.0078


(vi) 0.00805×100

=0.805


(vii) 0.0893×10000

=893


(viii) 357.126×10000

=3571260



Q2 | Ex-3B |Class7 | Decimals | S.Chand | Composite Mathematics | Chapter 3 | myhelper

Question 2

(i) 0.9×0.4

Sol : 0.36


(ii) 0.07×0.05

Sol : 0.0035


(iii) 0.008×3

Sol : 0.024


(iv) 0.006×0.009

Sol : 0.000054


(v) 0.8×0.09

Sol : 0.072


(vi) 2.63×0.0004

Sol : 0.001052


(vii) 150×0.007

Sol : 1.05


(viii) 52.8×0.007

Sol : 0.3696



Q3 | Ex-3B |Class 7 | Decimals | S.Chand | Composite Mathematics | Chapter 3 | myhelper

Question 3

(i) 5.9×2.3

Sol : 13.57


(ii) 0.009×0.049

Sol : 0.000441


(iii) 0.678×860

Sol : 583.08


(iv) 0.0095×81.7

Sol : 0.77615


(v) How many decimal places does $(1.4)^3$ have?

Sol : 

=2.744

=3 decimal places


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