1. find multiple of 12 that are between 20 and 70

Solution:
Multiples of 12 between 20 and 70

12	`xx`	2	=	24
12	`xx`	3	=	36
12	`xx`	4	=	48
12	`xx`	5	=	60

Multiples of 12 are `24,36,48,60`

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2. find multiple of 8 that are between 20 and 100

Solution:
Multiples of 8 between 20 and 100

8	`xx`	3	=	24
8	`xx`	4	=	32
8	`xx`	5	=	40
8	`xx`	6	=	48
8	`xx`	7	=	56
8	`xx`	8	=	64
8	`xx`	9	=	72
8	`xx`	10	=	80
8	`xx`	11	=	88
8	`xx`	12	=	96

Multiples of 8 are `24,32,40,48,56,64,72,80,88,96`

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3. find multiple of 9 that are between 50 and 100

Solution:
Multiples of 9 between 50 and 100

9	`xx`	6	=	54
9	`xx`	7	=	63
9	`xx`	8	=	72
9	`xx`	9	=	81
9	`xx`	10	=	90
9	`xx`	11	=	99

Multiples of 9 are `54,63,72,81,90,99`

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