When you ask "What number is halfway between 15 and 506?" 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=506.
To find the number halfway between 15 and 506, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 506 into our formula, we get:
(15 + 506)/2 = 260.5
Thus, the number halfway between 15 and 506 is 260.5.
To check that our answer is correct, we subtract 15 from 260.5 and subtract 260.5 from 506 and compare the two numbers:
260.5 - 15 = 245.5
506 - 260.5 = 245.5
As you can see, the halfway number is 245.5 higher than 15 and 245.5 lower than 506. Therefore, our halfway between answer of 260.5 above is correct.
Halfway Between
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Halfway Between 15 and 507
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