When you ask "What number is halfway between 18 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=18 and Y=86.
To find the number halfway between 18 and 86, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 86 into our formula, we get:
(18 + 86)/2 = 52
Thus, the number halfway between 18 and 86 is 52.
To check that our answer is correct, we subtract 18 from 52 and subtract 52 from 86 and compare the two numbers:
52 - 18 = 34
86 - 52 = 34
As you can see, the halfway number is 34 higher than 18 and 34 lower than 86. Therefore, our halfway between answer of 52 above is correct.
Halfway Between
Find halfway between two other numbers here!
Halfway Between 18 and 87
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