When you ask "What number is halfway between 86 and 120?" 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=120.
To find the number halfway between 86 and 120, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 86 and 120 into our formula, we get:
(86 + 120)/2 = 103
Thus, the number halfway between 86 and 120 is 103.
To check that our answer is correct, we subtract 86 from 103 and subtract 103 from 120 and compare the two numbers:
103 - 86 = 17
120 - 103 = 17
As you can see, the halfway number is 17 higher than 86 and 17 lower than 120. Therefore, our halfway between answer of 103 above is correct.
Halfway Between
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Halfway Between 86 and 121
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