When you ask "What number is halfway between 18 and 421?" 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=421.
To find the number halfway between 18 and 421, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 421 into our formula, we get:
(18 + 421)/2 = 219.5
Thus, the number halfway between 18 and 421 is 219.5.
To check that our answer is correct, we subtract 18 from 219.5 and subtract 219.5 from 421 and compare the two numbers:
219.5 - 18 = 201.5
421 - 219.5 = 201.5
As you can see, the halfway number is 201.5 higher than 18 and 201.5 lower than 421. Therefore, our halfway between answer of 219.5 above is correct.
Halfway Between
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Halfway Between 18 and 422
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