When you ask "What number is halfway between 3 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=3 and Y=312.
To find the number halfway between 3 and 312, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 3 and 312 into our formula, we get:
(3 + 312)/2 = 157.5
Thus, the number halfway between 3 and 312 is 157.5.
To check that our answer is correct, we subtract 3 from 157.5 and subtract 157.5 from 312 and compare the two numbers:
157.5 - 3 = 154.5
312 - 157.5 = 154.5
As you can see, the halfway number is 154.5 higher than 3 and 154.5 lower than 312. Therefore, our halfway between answer of 157.5 above is correct.
Halfway Between
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