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Not all multiples of 40 are multiples of 80. Only the even multiples of 40 are also multiples of 80. The odd multiples, e.g. 40, 120, 200, 280, and 360, are not multiples of 80.
the factors and multiples of 396 are 1,2,3,4,6,9,11,12,18,22,33,36,44,66,99,132,198,396
The first six multiples of 40 are 40, 80, 120, 160, 200, and 240.
40,80,120,160,200,240,280,320,360,400
All factors of a number n will be factors of any multiple of n. All multiples of a number n will be multiples of any factor of n.