When you ask "What number is halfway between 15 and 58?" 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=58.
To find the number halfway between 15 and 58, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 58 into our formula, we get:
(15 + 58)/2 = 36.5
Thus, the number halfway between 15 and 58 is 36.5.
To check that our answer is correct, we subtract 15 from 36.5 and subtract 36.5 from 58 and compare the two numbers:
36.5 - 15 = 21.5
58 - 36.5 = 21.5
As you can see, the halfway number is 21.5 higher than 15 and 21.5 lower than 58. Therefore, our halfway between answer of 36.5 above is correct.
Halfway Between
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Halfway Between 15 and 59
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