When you ask "What number is halfway between 86 and 309?" 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=309.
To find the number halfway between 86 and 309, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 86 and 309 into our formula, we get:
(86 + 309)/2 = 197.5
Thus, the number halfway between 86 and 309 is 197.5.
To check that our answer is correct, we subtract 86 from 197.5 and subtract 197.5 from 309 and compare the two numbers:
197.5 - 86 = 111.5
309 - 197.5 = 111.5
As you can see, the halfway number is 111.5 higher than 86 and 111.5 lower than 309. Therefore, our halfway between answer of 197.5 above is correct.
Halfway Between
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Halfway Between 86 and 310
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