NCERT solution Class 7 large numbers around us

NCERT Solutions

Class 7 Maths

Large Numbers Around Us

NCERT Questions

Ex. 1.1 Q.1
Ex. 1.1 Q.2
Ex. 1.1 Q.3
Ex. 1.1 Q.4
Ex. 1.1 Q.5
Ex. 1.1 Q.6
Ex. 1.1 Q.7
Ex. 1.1 Q.8
Ex. 1.1 Q.9
Ex. 1.1 Q.10
Ex. 1.2 Q.1
Ex. 1.2 Q.2
Ex. 1.2 Q.3
Ex. 1.2 Q.4
Ex. 1.3 Q.1
Ex. 1.3 Q.2
Ex. 1.3 Q.3
Ex. 1.3 Q.4
Ex. 1.3 Q.5
Ex. 1.3 Q.6
Ex. 1.3 Q.7
Ex. 1.3 Q.8
Ex. 1.3 Q.9
Ex. 1.4 Q.1
Ex. 1.4 Q.2
Ex. 1.4 Q.3
Ex. 1.4 Q.4
Ex. 1.4 Q.5
Ex. 1.4 Q.6
Ex. 1.4 Q.7

Ex. 1.1 Q.10

A water tank has steps inside it. A monkey is sitting on the topmost step (i.e., the first step).

The water level is at the ninth step:

(i) He jumps 3 steps down and then jumps back 2 steps up. In how many jumps will he reach the water level?

(ii) After drinking water, he wants to go back. For this, he jumps 4 steps up and then jumps back 2 steps down in every move. In how many jumps will he reach back the top step?

(iii) If the number of steps moved down is represented by negative integers and the number of steps move up by positive integers, represent his moves in part (i) and (ii) by completing the following:

(a) -3 + 2 - .......... = -8 (b) 4 - 2 +........ = 8

In (a) the sum (-8) represent going down by eight steps. So, what will the sum 8 in (b) represent?

(i) He jumps 3 steps down and jumps back 2 steps up. Following number ray shows the jumps of monkey:

First jump = 1 + 3 = 4 steps

Second jump = 4 – 2 = 2 steps

Third jump = 2 + 3 = 5 steps

Fourth jump = 5 – 2 = 3 steps

Fifth jump = 3 + 3 = 6 steps

Sixth jump = 6 – 2 = 4 steps

Seventh jump = 4 + 3 = 7 steps

Eighth jump = 7 – 2 = 5 steps

Ninth jump = 5 + 3 = 8 steps

Tenth jump = 8 – 2 = 6 steps

Eleventh jump = 6 + 3 = 9 steps

He will reach ninth steps in 11 jumps.

(ii) He jumps four steps and then jumps down 2 steps. Following number ray shows the jumps of monkey:

Thus monkey reach back on the first step in fifth jump.

(iii) (a) -3 + 2 – 3 + 2 – 3 + 2 – 3 + 2 – 3 + 2 – 3 + 2 – 3 + 2 – 3 + 2 = 8

(b) 4 – 2 + 4 – 2 + 4 – 2 + 4 – 2 = 8

Thus, sum 8 in (b) represents going up by eight steps.

Video solution:

Large Numbers Around Us Class 7 Maths NCERT Chapter 1 NCERT Solutions

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NCERT solutions of Large Numbers Around Us Class 7 Maths - all questions of all exercises are solved. Q. No. 1, 2, 3, and so on. Complete explanation and detailed solution makes them the best videos for Class 7 Maths Large Numbers Around Us NCERT solutions.