When you ask "What number is halfway between 18 and 797?" 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=797.
To find the number halfway between 18 and 797, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 797 into our formula, we get:
(18 + 797)/2 = 407.5
Thus, the number halfway between 18 and 797 is 407.5.
To check that our answer is correct, we subtract 18 from 407.5 and subtract 407.5 from 797 and compare the two numbers:
407.5 - 18 = 389.5
797 - 407.5 = 389.5
As you can see, the halfway number is 389.5 higher than 18 and 389.5 lower than 797. Therefore, our halfway between answer of 407.5 above is correct.
Halfway Between
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Halfway Between 18 and 798
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