What is Long, What is Round? Chapter Notes - Mathematics for Class 2: NCERT

Round and Long Objects

Once upon a time, there was a little girl named Aisha who loved to learn new things. She was in class 2. One day, her teacher was teaching the class about shapes and sizes, and Aisha was excited.

In her class, the teacher held up a ball and asked the class, "What do you think this is?" 

Can you tell me what it is?

Yes! It's round! This is a round ball.

Examples of round objects:

Next, The teacher held up a long, thin stick and asked the class, "What do you think this is?" 

Can you tell me what it is?

Yes! It's long! This is a long stick.

Examples of long objects:

Guess Its Name

Students, you now have to guess the name of the object by the clue given to you.

1. Pointed at one end, flat at the other, but round like a pipe. Guess what it is?

It is a pencil.

2. Round all around, has no corners, I can roll it in my hand. Guess what it is?

It can be a lemon

What Rolls, What Slides?

To roll means to rotate or spin over and over. 

Examples:

To slide means to move smoothly along a surface without rotating or turning. 

Example:

There are things which both roll and slide.

Example:

Ball rolls as it slides

The Tallest Tower

Students, have you ever seen a game called jenga? It is played with rectangular wooden blocks. The game is played by stacking the blocks in a tower and then carefully pulling out one block at a time, hoping that the tower won't collapse!

Jenga

Have you ever been to a shoe store and seen how the shoes are stacked on top of each other? They usually have a broad base and are arranged so that they don't fall over.

Let's talk about which shapes can be stacked on top of each other and which ones can't.

When we stack shapes on top of each other, we want to make sure that they are stable and won't fall over. Shapes with flat surfaces like matchbox, erasers etc. are easy to stack because they have a broad base and can be placed on top of each other without falling.

However, some shapes are more difficult to stack. Shapes like ice cream, ball etc. are not as stable because they don't have a flat base.