Numbers | Term 2 Chapter 2 | 5th Maths - Composite and Prime Numbers | 5th Maths : Term 2 Unit 2 : Numbers
Chapter: 5th Maths : Term 2 Unit 2 : Numbers
Composite and Prime Numbers
A natural number having more than 2 factors is called a composite number. A natural number greater than 1, having only two factors namely one and the number itself is called a prime number.
Activity
Tick the factors of the following numbers
Look at the table below and try to identify which numbers can divide the given numbers without leaving a remainder.
Composite and Prime Numbers
Composite Number:
A natural number having more than 2 factors is called a composite number.
Examples4, 6, 8, 9, 12, 26, 60, 448, 816,…
Prime number:
A natural number greater than 1, having only two factors namely one and the number itself is called a prime number.
Do you know? 2 is the only even prime number.
Examples
2, 3, 5, 7, 11, 13, 29, 37,….
COMMON FACTORS:
The factors that are common to two or more numbers is called common factors.
ExampleThe factors of 12, 18 are :
(i) The factors of 12 - 1, 2, 3, 4, 6, 12
(ii) The factors of 18 - 1, 2, 3, 6, 9, 18
(ii) The factors of 18 - 1, 2, 3, 6, 9, 18
The common factors of 12, 18 are 1, 2, 3 and 6.
Activity
Study the relationships between these numbers and their factors.