CBSE Class 2 Mathematics Chapter 1: What is Long, What is Round - NCERT Solutions

This question encourages you to observe objects around you and think about their shapes. While a pencil is pointed at one end and flat at the other, it is not typically round like a pipe. Let's think of objects that fit all the descriptions: pointed at one end, flat at the other, and round like a pipe.

Some common objects that match this description are:

• A pen: Many pens are pointed at the writing tip, flat at the end where the cap might go, and have a round barrel.
• A crayon: Similar to a pencil, a crayon has a pointed tip and a round body.
• A screw: A screw has a pointed end, a flat head (which can be considered the other end), and a threaded, round body.

The best answer depends on what you observe, but these are good examples that are pointed, flat, and round like a pipe.

This riddle describes an object that is perfectly round and has no edges or corners. The key clue is that it can be rolled easily in your hand. Let's think about objects that fit this description:

• A ball (like a tennis ball, cricket ball, or football): These are round, have no corners, and are designed to be rolled.
• A lemon: A lemon is generally round or oval, has no corners, and can be rolled.
• An orange: Similar to a lemon, an orange is round and can be rolled.

Any object that is spherical or nearly spherical and lacks corners would fit this description.

This is a fun game to play in class that helps you identify different shapes in the world around you. The goal is to name objects that are long and objects that are round, making sure not to repeat what your classmates have already said. Here are some examples to get you started:

Examples of Long Things:

• A cricket bat
• A sketch pen
• A measuring scale
• A pencil
• A straw
• A stick

Examples of Round Things:

• A football
• An orange
• A wheel
• A steel plate
• A CD (Compact Disc)
• A coin

Remember to look around your classroom, home, or playground for more ideas!

This activity is about exploring different objects and noticing their shapes and sizes. You should gather a variety of items like:

• Boxes: Look for different types of boxes, such as a shoebox, a cereal box, or a small jewelry box. Notice if they are rectangular or square.
• Balls: Collect different balls, like a tennis ball, a rubber ball, or a marble. Observe that they are round.
• Erasers: Erasers can be rectangular or square.
• Matchboxes: These are small rectangular boxes.
• Other items: You can also collect things like books, bottles, coins, or toys.

The purpose is to have a collection of objects with different shapes to observe and compare.

This activity involves building towers by stacking objects. You can try building towers using only one type of object at a time to see how stable they are and how high you can build them.

Using only matchboxes: Matchboxes are usually rectangular prisms. You can stack them one on top of another. Try stacking them flat or on their sides to see which way makes a taller or more stable tower.

Using only tins: Tins (like food cans) are usually cylindrical. They are round at the top and bottom and flat on the sides. You can stack them one on top of another. Since they are round, they might roll if not placed carefully, but stacking them straight up can create a tall tower.

You can also try mixing different objects, but this exercise focuses on using a single type of object to understand its stacking properties.

Let's think about a coin and how it moves on a flat surface. A coin is flat and round.

Rolling: If you place a coin on its edge and give it a push, it will spin and move forward, which is called rolling. You can see this happen when a coin spins on its side.

Sliding: If you place a coin flat on the surface and push it, it will move across the surface without spinning much. This movement, where the object stays flat and moves along, is called sliding.

So, yes, a coin can both roll (when on its edge) and slide (when flat).