When you ask "What number is halfway between 8 and 51?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=8 and Y=51.
To find the number halfway between 8 and 51, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 8 and 51 into our formula, we get:
(8 + 51)/2 = 29.5
Thus, the number halfway between 8 and 51 is 29.5.
To check that our answer is correct, we subtract 8 from 29.5 and subtract 29.5 from 51 and compare the two numbers:
29.5 - 8 = 21.5
51 - 29.5 = 21.5
As you can see, the halfway number is 21.5 higher than 8 and 21.5 lower than 51. Therefore, our halfway between answer of 29.5 above is correct.
Halfway Between
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Halfway Between 8 and 52
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