57 of them.
The first one is (1 x 7) = 7, and the 57th one is (57 x 7) = 399 .
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The multiples of 7 between 200 and 400 are: 203, 210, 217, 224, 231, 238, 245, 252, 259, 266, 273, 280, 287, 294, 301, 308, 315, 322, 329, 336, 343, 350, 357, 364, 371, 378, 385, 392, 399. The sum of all the multiples of 7 between 200 and 400 is 8,729.
You should know this. 150 300 350 500 900 84394 \\ these are wrong. Please do not look of the internet. it is cheeting
80, 160, 240, 320, 400
40, 80, 120, 160, 200, 240, 280, 320, 360, 400 . . .
The multiples of 20 are20,40,60,80,100,120,140,160,180,200,220...The multiples of 40 are40,80,120,160,200,240,280,420...The three smallest are 40,80,120