Well, darling, the whole number between 300 and 400 is 350. It's like the Goldilocks of numbers - not too big, not too small, just right. So go ahead and jot down 350 in your little math notebook and call it a day.
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100 is the greatest common factor between 300 and 400
300
This number would have to be a squared number as it only has 15 factors. The number I have calculated is 324 as the square root is 18
350 It is 50 more than 300 and 50 less than 400 To find a halfway point (which is also the average), add the numbers together and divide by 2.
The difference is 360. Find it out by doing 400-40=360