**Least Common Multiples Workbook**

All the composite numbers can be broken into their factors which are prime.

**Methods of finding factors of a number**

1. Prime factorisation method or Branching method :

2. Division method of prime factorisation :

**Problems**

1. The smallest prime number is :

2. How many prime nos are there from 1 to 100 ?

3. Which is the smallest composite number ?

4. Give an example of even prime number.

5. How many even prime numbers are there?

6. How many one digit prime numbers are there ?

7. What is the addition of first four prime numbers ?

8. Which is the smallest two digit composite number ?

9. Which is the smallest two digit prime number ?

10. Which is the biggest two digit prime number ?

11. Write 5 examples of coprime numbers.

12. Write 5 examples of twin prime numbers.

13. Write all the prime numbers between :

a. 14 and 35

b. 80 and 100

c. 51 and 72

d. 40 and 55

14. Write all the composite number between :

a. 20 and 45

b. 65 and 83

c. 85 and 100

d. 47 and 64

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