When you ask "What number is halfway between 18 and 859?" 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=859.
To find the number halfway between 18 and 859, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 859 into our formula, we get:
(18 + 859)/2 = 438.5
Thus, the number halfway between 18 and 859 is 438.5.
To check that our answer is correct, we subtract 18 from 438.5 and subtract 438.5 from 859 and compare the two numbers:
438.5 - 18 = 420.5
859 - 438.5 = 420.5
As you can see, the halfway number is 420.5 higher than 18 and 420.5 lower than 859. Therefore, our halfway between answer of 438.5 above is correct.
Halfway Between
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Halfway Between 18 and 860
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