When you ask "What number is halfway between 15 and 486?" 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=486.
To find the number halfway between 15 and 486, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 486 into our formula, we get:
(15 + 486)/2 = 250.5
Thus, the number halfway between 15 and 486 is 250.5.
To check that our answer is correct, we subtract 15 from 250.5 and subtract 250.5 from 486 and compare the two numbers:
250.5 - 15 = 235.5
486 - 250.5 = 235.5
As you can see, the halfway number is 235.5 higher than 15 and 235.5 lower than 486. Therefore, our halfway between answer of 250.5 above is correct.
Halfway Between
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Halfway Between 15 and 487
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