When you ask "What number is halfway between 86 and 121?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=86 and Y=121.
To find the number halfway between 86 and 121, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 86 and 121 into our formula, we get:
(86 + 121)/2 = 103.5
Thus, the number halfway between 86 and 121 is 103.5.
To check that our answer is correct, we subtract 86 from 103.5 and subtract 103.5 from 121 and compare the two numbers:
103.5 - 86 = 17.5
121 - 103.5 = 17.5
As you can see, the halfway number is 17.5 higher than 86 and 17.5 lower than 121. Therefore, our halfway between answer of 103.5 above is correct.
Halfway Between
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Halfway Between 86 and 122
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