When you ask "What number is halfway between 15 and 263?" 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=263.
To find the number halfway between 15 and 263, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 263 into our formula, we get:
(15 + 263)/2 = 139
Thus, the number halfway between 15 and 263 is 139.
To check that our answer is correct, we subtract 15 from 139 and subtract 139 from 263 and compare the two numbers:
139 - 15 = 124
263 - 139 = 124
As you can see, the halfway number is 124 higher than 15 and 124 lower than 263. Therefore, our halfway between answer of 139 above is correct.
Halfway Between
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Halfway Between 15 and 264
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