When you ask "What number is halfway between 51 and 312?" 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=312.
To find the number halfway between 51 and 312, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 312 into our formula, we get:
(51 + 312)/2 = 181.5
Thus, the number halfway between 51 and 312 is 181.5.
To check that our answer is correct, we subtract 51 from 181.5 and subtract 181.5 from 312 and compare the two numbers:
181.5 - 51 = 130.5
312 - 181.5 = 130.5
As you can see, the halfway number is 130.5 higher than 51 and 130.5 lower than 312. Therefore, our halfway between answer of 181.5 above is correct.
Halfway Between
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