replace 7 with x:
x+2x=3x
x+2x+3x=6x
all ten of them -> 55x
Put the 7 back in:
55(7)=385
OR:
The first ten multiples of 7 are
7,14,21,28,35,42,49,56,63,70
The product of the multiples will then be
7+14+21+28+35+42+49+56+63+70= 385 :)
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7 14 21 28 35 42 49 56 63 70
The first 3 multiples of 7 are: 7, 14, and 21.
7, 14, 21, 28, 35, 42, 49, 56, 63, 70
7,14,21,28,35
The first ten positive integer multiples of 7 are: 1 x 7 = 7 2 x 7 = 14 3 x 7 = 21 4 x 7 = 28 5 x 7 = 35 6 x 7 = 42 7 x 7 = 49 8 x 7 = 56 9 x 7 = 63 10 x 7 = 70