When you ask "What number is halfway between 86 and 205?" 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=205.
To find the number halfway between 86 and 205, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 86 and 205 into our formula, we get:
(86 + 205)/2 = 145.5
Thus, the number halfway between 86 and 205 is 145.5.
To check that our answer is correct, we subtract 86 from 145.5 and subtract 145.5 from 205 and compare the two numbers:
145.5 - 86 = 59.5
205 - 145.5 = 59.5
As you can see, the halfway number is 59.5 higher than 86 and 59.5 lower than 205. Therefore, our halfway between answer of 145.5 above is correct.
Halfway Between
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Halfway Between 86 and 206
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