Factors and multiples - Answers

Factors and multiples – 6

Find the HCF:

i	HCF of 20 & 45	=	5
ii	HCF of 16 & 56	=	8
iii	HCF of 25 & 90	=	5
iv	HCF of 48 & 108	=	12
v	HCF of 42, 70	=	14
vi	HCF of 24 & 57	=	3
vii	HCF of 60 & 70	=	10
viii	HCF of 81 & 117	=	9

Factors and multiples – 5

 List the factor pairs of the given number:

 

i	54	=	1 x 54		ii	63	=	1 x 63
		=	2 x 27				=	3 x 21
		=	3 x 18				=	7 x 9
		=	6 x 9
iii	75	=	1 x 75		iv	87	=	1 x 87
		=	3 x 25				=	3 x 29
		=	5 x 15
v	99	=	1 x 99		vi	128		1 x 128
		=	3 x 33					2 x 64
		=	9 x 11					4 x 32
								8 x 16
vii	144	=	1 x 144
		=	2 x 72
		=	3 x 48
		=	4 x 36
		=	6 x 24
		=	8 x 18
		=	12 x 12