When you ask "What number is halfway between 21 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=21 and Y=312.
To find the number halfway between 21 and 312, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 312 into our formula, we get:
(21 + 312)/2 = 166.5
Thus, the number halfway between 21 and 312 is 166.5.
To check that our answer is correct, we subtract 21 from 166.5 and subtract 166.5 from 312 and compare the two numbers:
166.5 - 21 = 145.5
312 - 166.5 = 145.5
As you can see, the halfway number is 145.5 higher than 21 and 145.5 lower than 312. Therefore, our halfway between answer of 166.5 above is correct.
Halfway Between
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