When you ask "What number is halfway between 15 and 111?" 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=111.
To find the number halfway between 15 and 111, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 111 into our formula, we get:
(15 + 111)/2 = 63
Thus, the number halfway between 15 and 111 is 63.
To check that our answer is correct, we subtract 15 from 63 and subtract 63 from 111 and compare the two numbers:
63 - 15 = 48
111 - 63 = 48
As you can see, the halfway number is 48 higher than 15 and 48 lower than 111. Therefore, our halfway between answer of 63 above is correct.
Halfway Between
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Halfway Between 15 and 112
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