When you ask "What number is halfway between 57 and 86?" 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=86.
To find the number halfway between 57 and 86, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 57 and 86 into our formula, we get:
(57 + 86)/2 = 71.5
Thus, the number halfway between 57 and 86 is 71.5.
To check that our answer is correct, we subtract 57 from 71.5 and subtract 71.5 from 86 and compare the two numbers:
71.5 - 57 = 14.5
86 - 71.5 = 14.5
As you can see, the halfway number is 14.5 higher than 57 and 14.5 lower than 86. Therefore, our halfway between answer of 71.5 above is correct.
Halfway Between
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