Page 73 - Maths Class 04

Here is a table which has several numbers in it. Some of them are multiples of 2.
Colour these multiples and leave the others.

2 15 1 3
19 24 66

4 2 12
3
18 20 11

7 6 16 1
10 8 20

3 44 7
5 14 9 17

Prime Numbers

A prime number has only two factors, 1 and the number itself. It cannot be

divided evenly by any other numbers. Here is a list of prime numbers from 1

to 100. There are 25 prime numbers between 1 and 100.

2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37

41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97

All these numbers cannot be changed into factors any further.

Composite Numbers

All composite numbers have more than two factors. Here is a list of composite

numbers upto 20.

4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20

All these numbers can be changed into factors further.

For example, 4 equals 2 times 2, 6 equals 3 times 2, 8 equals 4 times 2 and
so on.

Know
Know
Know
Get
Get to
Get
to
Zero and one are considered neither prime nor composite numbers.

Mathematics-4 73