When you ask "What number is halfway between 15 and 998?" 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=998.
To find the number halfway between 15 and 998, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 998 into our formula, we get:
(15 + 998)/2 = 506.5
Thus, the number halfway between 15 and 998 is 506.5.
To check that our answer is correct, we subtract 15 from 506.5 and subtract 506.5 from 998 and compare the two numbers:
506.5 - 15 = 491.5
998 - 506.5 = 491.5
As you can see, the halfway number is 491.5 higher than 15 and 491.5 lower than 998. Therefore, our halfway between answer of 506.5 above is correct.
Halfway Between
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Halfway Between 15 and 999
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