20, 40, 60, 80,... take any integer k, and 20k is a multiple of of 10 and 20
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They are 10 and 20
-the first 10 multiples of 20 are 20,40,60,80,100,120,140,160,180, and 200. :)
20,40,60,80,100,120,140,160,180,200
To get a multiple of a number, multiply that number by successive counting numbers. 10 x 1 = 10 10 x 2 = 20 10 x 3 = 30 10, 20, 30 are multiples of 10.
9 they are -20, -15, -10, -5, 0, 5, 10, 15, 20.