When you ask "What number is halfway between 15 and 207?" 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=207.
To find the number halfway between 15 and 207, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 207 into our formula, we get:
(15 + 207)/2 = 111
Thus, the number halfway between 15 and 207 is 111.
To check that our answer is correct, we subtract 15 from 111 and subtract 111 from 207 and compare the two numbers:
111 - 15 = 96
207 - 111 = 96
As you can see, the halfway number is 96 higher than 15 and 96 lower than 207. Therefore, our halfway between answer of 111 above is correct.
Halfway Between
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Halfway Between 15 and 208
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