When you ask "What number is halfway between 99 and 378?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=99 and Y=378.
To find the number halfway between 99 and 378, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 378 into our formula, we get:
(99 + 378)/2 = 238.5
Thus, the number halfway between 99 and 378 is 238.5.
To check that our answer is correct, we subtract 99 from 238.5 and subtract 238.5 from 378 and compare the two numbers:
238.5 - 99 = 139.5
378 - 238.5 = 139.5
As you can see, the halfway number is 139.5 higher than 99 and 139.5 lower than 378. Therefore, our halfway between answer of 238.5 above is correct.
Halfway Between
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Halfway Between 99 and 379
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