When you ask "What number is halfway between 57 and 99?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=57 and Y=99.
To find the number halfway between 57 and 99, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 57 and 99 into our formula, we get:
(57 + 99)/2 = 78
Thus, the number halfway between 57 and 99 is 78.
To check that our answer is correct, we subtract 57 from 78 and subtract 78 from 99 and compare the two numbers:
78 - 57 = 21
99 - 78 = 21
As you can see, the halfway number is 21 higher than 57 and 21 lower than 99. Therefore, our halfway between answer of 78 above is correct.
Halfway Between
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Halfway Between 57 and 100
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