When you ask "What number is halfway between 30 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=30 and Y=399.
To find the number halfway between 30 and 399, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 399 into our formula, we get:
(30 + 399)/2 = 214.5
Thus, the number halfway between 30 and 399 is 214.5.
To check that our answer is correct, we subtract 30 from 214.5 and subtract 214.5 from 399 and compare the two numbers:
214.5 - 30 = 184.5
399 - 214.5 = 184.5
As you can see, the halfway number is 184.5 higher than 30 and 184.5 lower than 399. Therefore, our halfway between answer of 214.5 above is correct.
Halfway Between
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Halfway Between 30 and 400
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