
When you ask "What number is halfway between 15 and 491?" 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=491.

To find the number halfway between 15 and 491, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 491 into our formula, we get:
(15 + 491)/2 = 253
Thus, the number halfway between 15 and 491 is 253.
To check that our answer is correct, we subtract 15 from 253 and subtract 253 from 491 and compare the two numbers:
253 - 15 = 238
491 - 253 = 238
As you can see, the halfway number is 238 higher than 15 and 238 lower than 491. Therefore, our halfway between answer of 253 above is correct.
Halfway Between
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Halfway Between 15 and 492
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