When you ask "What number is halfway between 15 and 310?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=15 and Y=310.
To find the number halfway between 15 and 310, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 310 into our formula, we get:
(15 + 310)/2 = 162.5
Thus, the number halfway between 15 and 310 is 162.5.
To check that our answer is correct, we subtract 15 from 162.5 and subtract 162.5 from 310 and compare the two numbers:
162.5 - 15 = 147.5
310 - 162.5 = 147.5
As you can see, the halfway number is 147.5 higher than 15 and 147.5 lower than 310. Therefore, our halfway between answer of 162.5 above is correct.
Halfway Between
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Halfway Between 15 and 311
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