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Of course there is no way to write them all because there are an infinite number of them.
Start with 400x1=400
Next 400x2=800
Then 400x3=1200.
Keep going with 400x4, 400x5, 400x6 etc.
In general the multiples of 400 are written as 400k for natural numbers k=1,2,3...

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15y ago

What else can I help you with?