Hide and Seek | Maths Grade 4 CBSE

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Six number ideas

Numbers follow rules. Tap each term to see what it means, with an everyday example.

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An even number shares into two equal groups with nothing left over. It ends in 0, 2, 4, 6 or 8.
An odd number always leaves one extra. It ends in 1, 3, 5, 7 or 9.
Just look at the last digit to decide — 248 ends in 8, so it is even; 73 ends in 3, so it is odd.

Worked example. Is 56 even or odd? How can 2 friends share it?

56 ends in 6, so it is even. It splits into two equal groups of 28 with none left over.

Skip counting means counting in equal jumps instead of one by one.
Count by 2s: 2, 4, 6, 8...; by 5s: 5, 10, 15, 20...; by 10s: 10, 20, 30, 40...
Skip counting helps you count quickly and is the start of the multiplication tables.

Worked example. There are 7 autos and each carries 3 children. Skip count by 3 to find the total.

3, 6, 9, 12, 15, 18, 21. So 7 autos carry 21 children.

A number pattern follows a rule, like add 4 each time or take away 2 each time.
To find the next number, work out the jump between two numbers, then jump again.
Patterns can go up (5, 10, 15) or down (20, 16, 12).

Worked example. What comes next: 8, 11, 14, 17, __ ?

Each number jumps up by 3 (8+3=11, 11+3=14...). So the next number is 17 + 3 = 20.

Common mix-up: Always check the jump between TWO numbers before deciding the rule — one number alone cannot tell you the pattern.

Where you’ll meet it

Knowing even and odd tells you in a blink whether a packet of biscuits will share fairly between two friends.

A shopkeeper skip-counts coins in 5s and 10s — much faster than counting one rupee at a time.

On one side of a street the house numbers are often all odd, and all even on the other — a hidden pattern.

Check yourself

Ten friendly questions — mostly multiple-choice with one assertion–reason — to check you can spot even, odd and patterns.

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