When you ask "What number is halfway between 15 and 105?" 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=105.
To find the number halfway between 15 and 105, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 105 into our formula, we get:
(15 + 105)/2 = 60
Thus, the number halfway between 15 and 105 is 60.
To check that our answer is correct, we subtract 15 from 60 and subtract 60 from 105 and compare the two numbers:
60 - 15 = 45
105 - 60 = 45
As you can see, the halfway number is 45 higher than 15 and 45 lower than 105. Therefore, our halfway between answer of 60 above is correct.
Halfway Between
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Halfway Between 15 and 106
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