When you ask "What number is halfway between 12 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=12 and Y=399.
To find the number halfway between 12 and 399, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 399 into our formula, we get:
(12 + 399)/2 = 205.5
Thus, the number halfway between 12 and 399 is 205.5.
To check that our answer is correct, we subtract 12 from 205.5 and subtract 205.5 from 399 and compare the two numbers:
205.5 - 12 = 193.5
399 - 205.5 = 193.5
As you can see, the halfway number is 193.5 higher than 12 and 193.5 lower than 399. Therefore, our halfway between answer of 205.5 above is correct.
Halfway Between
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Halfway Between 12 and 400
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