When you ask "What number is halfway between 24 and 399?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=24 and Y=399.
To find the number halfway between 24 and 399, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 24 and 399 into our formula, we get:
(24 + 399)/2 = 211.5
Thus, the number halfway between 24 and 399 is 211.5.
To check that our answer is correct, we subtract 24 from 211.5 and subtract 211.5 from 399 and compare the two numbers:
211.5 - 24 = 187.5
399 - 211.5 = 187.5
As you can see, the halfway number is 187.5 higher than 24 and 187.5 lower than 399. Therefore, our halfway between answer of 211.5 above is correct.
Halfway Between
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Halfway Between 24 and 400
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