NCERT Book Class 4 Maths How Heavy How Light

How Heavy? How Light?

Jaiju and Mannu were shifting house. They loaded all their things on a horse-cart. There were many things like a water tank, five sacks of wheat, three tables, an almirah, four chairs, two mattresses, three sacks of rice, a bamboo ladder, pots and pans.

When they were ready to move, the horse refused to start. They wondered why Their father said that this horse was not well and would not pull a load than 700 kg. Oh! But how heavy is this load?—they asked.

Father gave them some idea of the weight of each thing. 

Find out the total weight they had loaded on the cart.

Now they decided to remove a few things from the cart.

Which things should be removed so that the weight of the load is not more than 700 kgs?

The things which were loaded on the cart were big in size and also very heavy. To measure the weight of such heavy and big things, we need a big balance.

But Jaiju and Mannu wanted to make their own balance. They collected a few things — a stick, two lids and a thick thread. They made this balance. 

❊ Now you also make your own balance. Write down how you made it. Also draw a picture of your balance in the box below.

Making Weights

Do this activity in pairs. You need a balance, weights, a cake of soap, plastic packets, sand and rubber bands. You can also take help of an older person.

Get a new cake of soap. The packet will have the weight written on it. You can use this soap to make your own different weights.

The soap weighs ____________ grams (g).

Take a small plastic packet.

Put it in one pan of the balance. Put the soap in the other pan.

Slowly add sand to the packet till the pans are balanced.

Close the packet with rubber band or string.Now stick a strip of paper  and write'____ g' on it.

If you put the soap and the weight you just made together  in a pan how many grams will both these weigh? ________

Now make different weights — 150g,200g and 250g You can use soaps of different weights for this.

Also make some bigger weights of 500g,1000g and 750g.

❊ Use your weights to weigh different things and write in your notebook.

Please refer to attached file for NCERT Class 4 Maths How Heavy How Light