When you ask "What number is halfway between 6 and 15?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=6 and Y=15.
To find the number halfway between 6 and 15, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 6 and 15 into our formula, we get:
(6 + 15)/2 = 10.5
Thus, the number halfway between 6 and 15 is 10.5.
To check that our answer is correct, we subtract 6 from 10.5 and subtract 10.5 from 15 and compare the two numbers:
10.5 - 6 = 4.5
15 - 10.5 = 4.5
As you can see, the halfway number is 4.5 higher than 6 and 4.5 lower than 15. Therefore, our halfway between answer of 10.5 above is correct.
Halfway Between
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