When you ask "What number is halfway between 15 and 26?" 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=26.
To find the number halfway between 15 and 26, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 26 into our formula, we get:
(15 + 26)/2 = 20.5
Thus, the number halfway between 15 and 26 is 20.5.
To check that our answer is correct, we subtract 15 from 20.5 and subtract 20.5 from 26 and compare the two numbers:
20.5 - 15 = 5.5
26 - 20.5 = 5.5
As you can see, the halfway number is 5.5 higher than 15 and 5.5 lower than 26. Therefore, our halfway between answer of 20.5 above is correct.
Halfway Between
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Halfway Between 15 and 27
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