multiples of 400: 400, 800, 1200, 1600, 2000, 2400, ...
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there are 9 multiples. they are 300,312,324,336,348,360,372,384,396.
400, 800, 1200 and so on to infinity.
9
All of the four-digit multiples of 400 end in 00.
100, 200, 300, 400, 500