When you ask "What number is halfway between 71 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=71 and Y=312.
To find the number halfway between 71 and 312, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 71 and 312 into our formula, we get:
(71 + 312)/2 = 191.5
Thus, the number halfway between 71 and 312 is 191.5.
To check that our answer is correct, we subtract 71 from 191.5 and subtract 191.5 from 312 and compare the two numbers:
191.5 - 71 = 120.5
312 - 191.5 = 120.5
As you can see, the halfway number is 120.5 higher than 71 and 120.5 lower than 312. Therefore, our halfway between answer of 191.5 above is correct.
Halfway Between
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