Class 4 Maths Mela Chapter 6 Measuring Length NCERT Solutions
Class 4 Maths Mela Chapter 6 Measuring Length NCERT Solutions provide in-depth solutions to all the questions presented in Chapter 6 of the Class 4 Maths textbook. The study material provided here covers measuring the height and length of objects, comparison of lengths of different objects, conversion of one unit to another, analysing numbers on a number line, and estimating the perimeter of shapes using a scale.
Class 4 Maths Mela Chapter 6 Measuring Length Questions Answers – PDF Download
Page 80
Let Us Observe
1. Look at the picture. What are the students measuring? Put a tick mark (✔️) if you find it being measured.
a) Length ____ c) Weight ____ e) Breadth ____
b) Height ____ d) Depth ____ f) Temperature ____
Solution:
b) Height, c) Weight, f) Temperature.
2. What is being used to measure the height? What other tools can be used to measure height?
Solution:
A stadiometer is being used to measure the height. Some other tools to measure height include measuring tape, height rods etc.
3. Recall in Grade 3 you studied that lengths are measured in metres. Check and fill in the blanks whether the following are correct/incorrect for your classroom.
a) The height of most of the students in my grade is more than a metre. _______________
b) The length of my arm is less than a metre. _______________
c) The height of the door of the grade is less than a metre. __________
d) The breadth of the blackboard is more than a metre. ___________
Solution:
a) Correct.
b) Correct.
c) Incorrect, as classroom doors are typically around 2 metres high or more.
d) Correct.
Page 81
Let Us Do
1. Walk, Jump, and Crawl on 1, 5 and 10 m line.
Draw lines of 1 m, 5 m, and 10 m on the floor of the classroom or outside in the playground. How will you make these lines? Think and share with your friends. Walk, jump, and crawl on the lines.
Solution:
These lines of 1, 5, and 10 meters can be made by stretching ropes of the required lengths and laying them on the ground or floor of the classroom.
Page 82
2. Long Jump
Each child can participate in a long jump competition. How far have your friends jumped? Measure as accurately as possible using a combination of ropes. Who jumped the longest distance? Who has jumped the shortest?
Solution:
Aditya jumped the longest, and Akshara jumped the shortest.
3. Estimate how long and broad is your classroom. Measure and check.
Solution:
The length of my classroom is 9 m and the breadth is 7 m.
Page 83
Let Us Think: Guess the Length
Look at the pictures carefully and answer the questions.
1. What is the length of one bus in metres? What is the length of one cricket bat in metres?
Solution:
Length of two buses combined = 15 metres.
Length of one bus = 30 ¸ 2 = 15 metres.
Length of one cricket bat = 1 metre.
2. How many buses would be equal to the length of two blue whales?
Solution:
Number of buses equal to the length of one blue whale = 2.
Number of buses equal to the length of two blue whales = 2 × 2 = 4.
3. How many cricket bats will be needed to measure one whale?
Solution:
Length of one cricket bat = 1 m
Length of whale = 30 m
Number of cricket bats needed to measure one whale = 30 × 1 = 30 bats.
4. If two ostriches stand one above another, their height will be equal to the height of ______________.
Solution:
Height of 2 ostriches = 2 × 3 = 6 m.
Thus, if two ostriches stand one above another, their height will be equal to the height of a crocodile.
5. How many crocodiles will be equal to the length of a blue whale?
Solution:
Length of crocodile = 6 m
Length of blue whale = 30 m
Number of crocodiles equal to the length of a blue whale = 30 × 6 = 5 crocodiles.
Page 84
Let Us Observe
Q. 1 metre (m) = 100 centimetre (cm)
1/2 m =_____cm, 1/4 m =_____cm
Solution:
1/2 m = 100 ÷ 2 = 50 cm.
1/4 m = 100 ÷ 4 = 25 cm.
Page 85
1. Measure each object using a scale.
Solution:
Rubber < Pencil = Comb < Hollow tube.
Page 86
2. Estimate the lengths of the following and compare your responses with your friends, in the grade. Write some examples of things that can be lesser than or equal to 1 cm in length. Verify by measuring.
Solution:
Do it yourself.
3. Take three toy cars and find out how far each one can go. You can use a small wooden ramp, or you might like to make a ramp using any material that you have.
Measure the distance each of your cars travels using measuring tape and write the answers in cm.
Solution:
Do it yourself.
Page 87
4. Find the longest and the shortest route in this treasure hunt. You can go around the obstacles but cannot jump over them. You can only walk on the yellow tiles and not on the grass. Can you find the length of your route in centimetres? Look for the 1 cm clue in the map.
Solution:
Page 88
5. Trace your hand on a piece of paper. Measure it using the scale.
Length of my hand = ________ cm
Solution:
Do it yourself.
6. Use your hand to estimate the measurement of any object. Convert into centimetres. Verify using the scale.
Solution:
Do it yourself.
7. Ashwin’s scale is broken. Can you help him to measure using this scale?
Solution:
Page 89
8. Fill in the blanks on the number line below appropriately.
Solution:
25 cm = 100 ÷ 4 = 1/4 cm.
9. The length of a board is 2 metres. Sonu has a decorative border sticker which is 20 cm long. How many such stickers are needed to cover the length of the board completely?
Solution:
Length of board = 2 metres = 2 × 100 cm = 200 cm.
Length of sticker = 20 cm.
Number of stickers needed to cover the length of the board = 200 ÷ 20 = 10 stickers.
Page 90
Let Us Do
1. The Village Sarpanch got the depth of some wells in his village measured by two different people.
a) Fill the blanks such that the depths are the same.
i) 2m = 200 cm
ii) ____ m = 400 cm
iii) 6 m = ____ cm
iv) ____ m = 800 m
Solution:
(i) 2 m = 2 × 100 = 200 cm
(ii) 4 m = 4 × 100 = 400 cm
(iii) 6 m = 6 × 100 = 600 cm
(iv) 8 m = 8 × 100 = 800 cm
2. Identify the wells with the same depth and match them.
Solution:
Let Us Explore
Activity: Students will measure their height using a measuring tape. Make a table in your notebook and complete it.
Answer the following questions.
1. Height of the tallest child is _____.
2. Height of the shortest child is _____.
3. Number of children who are more than 1 m tall _____.
4. Number of children who are shorter than 1 m _____.
Solution:
Do it yourself.
Page 91
Q. Bhola is making a boundary with bricks for his vegetable garden. Colour the bricks on the boundary. How many bricks will he need to make the boundary?
Solution:
He will need 21 more bricks to make the boundary.
Page 92
Let Us Do
1. Bhola made the boundary of his gardens in the following ways. Circle the boundary that is longest.
Solution:
2. Let us find the perimeter of some shapes using the dot grid. One is done for you.
a) Colour the boundary with the longest length in blue.
b) Colour the boundary with the shortest length in green.
c) Tick the shapes with the same length.
Solution:
From a – c, do it yourself.
Page 93
3. Do any of the following shapes have the same perimeter? Tick them.
Solution:
Figures A and C have the same perimeter.
Also, figures D, E and F have the same perimeter.
4. Tick the garden with the minimum perimeter.
Solution:
1st garden has the minimum perimeter.
Page 94
5. Estimate and measure the perimeters of shapes around you using a scale and write them in the space given below.
Solution:
Do it yourself.
6. Draw three different shapes with perimeter of 20 cm.
Solution:
