When you ask "What number is halfway between 72 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=72 and Y=399.
To find the number halfway between 72 and 399, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 72 and 399 into our formula, we get:
(72 + 399)/2 = 235.5
Thus, the number halfway between 72 and 399 is 235.5.
To check that our answer is correct, we subtract 72 from 235.5 and subtract 235.5 from 399 and compare the two numbers:
235.5 - 72 = 163.5
399 - 235.5 = 163.5
As you can see, the halfway number is 163.5 higher than 72 and 163.5 lower than 399. Therefore, our halfway between answer of 235.5 above is correct.
Halfway Between
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Halfway Between 72 and 400
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