NCERT Solution class 7 Mathematics EXERCISE- 2.6
CHAPTER -2
EXERCISE -2.6
Q1. Find:
(i) 0.2 x 6
SOLUTION:-
We have,
= (2/10) x 6
= (12/10)
On dividing a decimal by 10,the decimal point is shifted to the left by one place .
Then,
= 1.2
(ii) 8 x 4.6
SOLUTION:-
= 36.8
(iii) 2.71 x 5
SOLUTION:-
= 13.55
(iv) 20.1 x 4
SOLUTION:-
= 80.4
(v) 0.05 x 7
SOLUTION:-
= 0.35
(vi) 211.02 x 4
SOLUTION:-
= 844.08
(vii) 2 x 0.86
SOLUTION:-
= 1.72
Q2. Find the area of rectangle whose length is 5.7 cm and breadth is 3 cm.
SOLUTION:-
Area of rectangle = 2(l + b)
= 2 x 8.7
= 17.4 cm2.
Q3. Find:
(i) 1.3 x 10
SOLUTION:-
= 13
(ii) 36.8 x 10
SOLUTION:-
= 368
(iii) 153.7 x 10
SOLUTION:-
= 1537
(iv) 168.07 x 10
SOLUTION:-
= 1680.70
(v) 31.1 x 100
SOLUTION:-
= 3110
(vi) 156.1 x 100
SOLUTION:-
= 15610
(vii) 3.62 x 100
SOLUTION:-
= 362
(viii) 43.07 x 100
SOLUTION:-
= 4307
(ix) 0.5 x 10
SOLUTION:-
= 5
(x) 0.08 x 10
SOLUTION:-
= 0.8
(xi) 0.9 x 100
SOLUTION:-
= 90
(xii) 0.03 x 1000
SOLUTION:-
= 30
Q4. A two wheeler covers a distance of 55.3 km in one liter petrol . How much distance will it cover in 10 liters of petrol ?
SOLUTION:-
From the question, it is given that ,
Distance covered by two wheeler in 1 liter petrol = 55.3 km
Then,
Distance covered by two wheeler in 10 liters petrol = ( 10 x 55.3)
= 553 km
Two wheeler covers a distance in 10 liters petrol is 553 km.
Q5. Find:
(i) 2.5 x 0.3
SOLUTION:-
= 0.75
(ii) 0.1 x 51.7
SOLUTION:-
= 5.17
(iii) 0.2 x 316.8
SOLUTION:-
= 63.36
(iv) 1.3 x 3.1
SOLUTION:-
= 4.03
(v) 0.5 x 0.05
SOLUTION:-
= 0.025
(vi) 11.2 x 0.15
SOLUTION:-
= 1.68
(vii) 1.07 x 0.02
SOLUTION:-
= 0.0214
(viii) 10.05 x 1.05
SOLUTION:-
= 10.5525
(ix) 101.01 x 0.01
SOLUTION:-
= 1.0101
(x) 100.01 x 1.1
SOLUTION:-
= 110.011