When you ask "What number is halfway between 18 and 423?" 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=423.
To find the number halfway between 18 and 423, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 423 into our formula, we get:
(18 + 423)/2 = 220.5
Thus, the number halfway between 18 and 423 is 220.5.
To check that our answer is correct, we subtract 18 from 220.5 and subtract 220.5 from 423 and compare the two numbers:
220.5 - 18 = 202.5
423 - 220.5 = 202.5
As you can see, the halfway number is 202.5 higher than 18 and 202.5 lower than 423. Therefore, our halfway between answer of 220.5 above is correct.
Halfway Between
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Halfway Between 18 and 424
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