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NCERT Solutions for Class 4th Maths Chapter 8 Lifting, packing and matching weights — Let Us Do

Book page 121 Updated on2026-09-19

Q1.
Try to lift some objects around you and write the names of three objects that you can lift easily. Estimate and write their weights.
Answer

Pick things you can hold in one hand and carry across the room.

Sample answer:

  1. My geometry box — about 200 g
  2. My water bottle when it is full — about 1 kg
  3. A pair of slippers — about 300 g

Why it happens: Anything lighter than about 2 kg is easy for a Class 4 child to lift. A full 1 litre water bottle is a good yardstick — it weighs about 1 kg.
Tip: To estimate, hold the object in one hand and a 1 kg salt packet in the other. If the object feels lighter, its weight is less than 1 kg.
Q2.
Now write the names of things that you can lift with a lot of effort. Estimate and write their weights.
Answer

Now pick things that need both hands, and that you can lift only for a moment.

Sample answer:

  1. A 10 kg sack of atta — about 10 kg
  2. A bucket full of water — about 15 kg
  3. A wooden chair — about 8 kg

Why it happens: Once a thing crosses about 5 kg, one hand is not enough. Our arms must pull much harder, and that is what we call effort.
Tip: Never try to lift something that is too heavy for you. Ask an elder for help.
Q3.
How many 1 kg packets are in a. 10 kg b. 20 kg c. 50 kg d. 25 kg
Answer

Each packet holds 1 kg, so the number of packets is simply the number of kilograms.

Total weightWorkingNumber of 1 kg packets
a. 10 kg1 kg ten times = 10 kg10
b. 20 kg1 kg twenty times = 20 kg20
c. 50 kg1 kg fifty times = 50 kg50
d. 25 kg1 kg twenty-five times = 25 kg25

a. 10   b. 20   c. 50   d. 25

Why it happens: When each packet weighs exactly 1 kg, one packet is needed for every kilogram. So 10 kg needs 10 packets, 20 kg needs 20 packets, and so on.
Tip: Careful — the Hindi edition asks the same question about 5 kg bags, so its answers are different.
Q4.
Match the objects in the left column with their estimated weights in the right column.
Left columnRight column
A cat1 g to 5 g
An elephant150 kg to 300 kg
A 1 litre filled bottle3 kg to 5 kg
A tiger10 g to 15 g
An empty gas cylinder6 kg to 10 kg
A penMore than 1000 kg
A leaf15 kg
A wooden chair800 g to 1000 g
Answer

These are the two columns printed on page 121:

Left columnRight column
A cat1 g to 5 g
An elephant150 kg to 300 kg
A 1 litre filled bottle3 kg to 5 kg
A tiger10 g to 15 g
An empty gas cylinder6 kg to 10 kg
A penMore than 1000 kg
A leaf15 kg
A wooden chair800 g to 1000 g

The correct matching is:

ObjectIts estimated weight
A cat3 kg to 5 kg
An elephantMore than 1000 kg
A 1 litre filled bottle800 g to 1000 g
A tiger150 kg to 300 kg
An empty gas cylinder15 kg
A pen10 g to 15 g
A leaf1 g to 5 g
A wooden chair6 kg to 10 kg
Why it happens: We match by thinking of something we already know. A 1 litre bottle of water weighs about 1000 g, a cat is about as heavy as a small school bag, and an elephant is heavier than a car.
Tip: Notice the order of size: leaf < pen < bottle < cat < chair < gas cylinder < tiger < elephant.
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