When you ask "What number is halfway between 51 and 317?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=51 and Y=317.
To find the number halfway between 51 and 317, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 317 into our formula, we get:
(51 + 317)/2 = 184
Thus, the number halfway between 51 and 317 is 184.
To check that our answer is correct, we subtract 51 from 184 and subtract 184 from 317 and compare the two numbers:
184 - 51 = 133
317 - 184 = 133
As you can see, the halfway number is 133 higher than 51 and 133 lower than 317. Therefore, our halfway between answer of 184 above is correct.
Halfway Between
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Halfway Between 51 and 318
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