When you ask "What number is halfway between 18 and 991?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=18 and Y=991.
To find the number halfway between 18 and 991, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 991 into our formula, we get:
(18 + 991)/2 = 504.5
Thus, the number halfway between 18 and 991 is 504.5.
To check that our answer is correct, we subtract 18 from 504.5 and subtract 504.5 from 991 and compare the two numbers:
504.5 - 18 = 486.5
991 - 504.5 = 486.5
As you can see, the halfway number is 486.5 higher than 18 and 486.5 lower than 991. Therefore, our halfway between answer of 504.5 above is correct.
Halfway Between
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Halfway Between 18 and 992
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