When you ask "What number is halfway between 18 and 997?" 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=997.
To find the number halfway between 18 and 997, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 997 into our formula, we get:
(18 + 997)/2 = 507.5
Thus, the number halfway between 18 and 997 is 507.5.
To check that our answer is correct, we subtract 18 from 507.5 and subtract 507.5 from 997 and compare the two numbers:
507.5 - 18 = 489.5
997 - 507.5 = 489.5
As you can see, the halfway number is 489.5 higher than 18 and 489.5 lower than 997. Therefore, our halfway between answer of 507.5 above is correct.
Halfway Between
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Halfway Between 18 and 998
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