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NCERT · Class 4 · Maths

Chapter 13: Fields and Fences

Practice each question, then open the answer or worked solution.

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Practice Time

3 questions
Q1Written answer

Here are pictures of some more fields. Find out which one has the longest boundary.

NCERT Solutions for Class 4 Chapter 13 Image 4

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Worked solution

Here we know that the length of boundary = 15 + 6 + 15 + 24 = 60 m

NCERT Solutions for Class 4 Chapter 13 Image 5

Here we know that the length of the boundary = 9 + 6 + 3 + 6 + 6 + 12 = 42 m

NCERT Solutions for Class 4 Chapter 13 Image 6

Here we know that length of boundary = 9 + 12 + 15 = 36 m

NCERT Solutions for Class 4 Chapter 13 Image 7

Here we know that the length of the boundary = 15 + 15 + 9 + 15 + 15 + 9 = 78 m

Hence, field (d) has the longest boundary.

NCERT Textbook Page No. – 152

Q2Written answer

Chandu’s father is called the ‘young old man’ in his village. At 70 years of age, he is fully fit. Do you know his secret? He goes for a walk around the field every morning. Every day he takes four rounds of Chandu’s field.

What is the total distance he covers?

4 × ____ = ____ m = ____ km

NCERT Solutions for Class 4 Chapter 13 Image 8

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Worked solution

We know that the boundary of the field = 150 + 100 + 150 + 100 = 500 m

So the distance covered by the ‘young old man’ = 4 × 500 = 2000 m = 2 km

Q3Written answer

Ganpat’s wife works in a tailor’s shop. She has to fix lace around a table cloth.

She bought a 100 metre roll of lace.

(a) Look at the picture of the table cloth and tell how much lace is used for one table cloth.

NCERT Solutions for Class 4 Chapter 13 Image 9

(b) How much lace will be used in 3 such tablecloths?

(c) How much lace will be left in the roll?

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Worked solution

(a) We know that

1 m 50 cm = 100 cm + 50 cm = 150 cm

So the length of lace required for one tablecloth = 150 + 50 + 150 + 50

= 400 cm = 4 m

(b) We know that the requirement of lace for 1 tablecloth = 4 m

Requirement of lace for 3 table cloth = 4 × 3 = 12 m

(c) It is given that

The total length of lace = 100 m

Requirement of lace for 3 table cloth = 12 m

Lace left out after making 3 table cloths = 100 – 12 = 88 m

NCERT Textbook Page No. – 153