When you ask "What number is halfway between 18 and 989?" 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=989.
To find the number halfway between 18 and 989, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 989 into our formula, we get:
(18 + 989)/2 = 503.5
Thus, the number halfway between 18 and 989 is 503.5.
To check that our answer is correct, we subtract 18 from 503.5 and subtract 503.5 from 989 and compare the two numbers:
503.5 - 18 = 485.5
989 - 503.5 = 485.5
As you can see, the halfway number is 485.5 higher than 18 and 485.5 lower than 989. Therefore, our halfway between answer of 503.5 above is correct.
Halfway Between
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Halfway Between 18 and 990
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