When you ask "What number is halfway between 86 and 427?" 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=427.
To find the number halfway between 86 and 427, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 86 and 427 into our formula, we get:
(86 + 427)/2 = 256.5
Thus, the number halfway between 86 and 427 is 256.5.
To check that our answer is correct, we subtract 86 from 256.5 and subtract 256.5 from 427 and compare the two numbers:
256.5 - 86 = 170.5
427 - 256.5 = 170.5
As you can see, the halfway number is 170.5 higher than 86 and 170.5 lower than 427. Therefore, our halfway between answer of 256.5 above is correct.
Halfway Between
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Halfway Between 86 and 428
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