Question

1) Find the HCF of each set of numbers:
a) 18, 24
b) 45, 55, 95
2) Find the LCM of each set of numbers:
a) 6, 9
b) 10, 15
3) Find the prime factorisation by factor tree method:
a) 60
b) 128
4) Find the prime factorisation by division method:
a) 999
b) 144
5) a) Write the smallest and the biggest two digit prime number.
b) Write the smallest and the biggest three digit composite number.

Answer 1

Answer:

1. a)6

b) 5

2. a)18

b)30

Step-by-step explanation:

1. a)6

b) 5

2. a)18

b)30

Answer 2

Answer:

5) a

Explanation: The third smallest prime number is 5. (Don't forget that 2 is a prime number, but 1 is not!) The smallest two digit prime number is 11

b) The smallest 3-digit number is 100 and the largest 3-digit number is 999.