
When you ask "What number is halfway between 13 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=13 and Y=421.

To find the number halfway between 13 and 421, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 13 and 421 into our formula, we get:
(13 + 421)/2 = 217
Thus, the number halfway between 13 and 421 is 217.
To check that our answer is correct, we subtract 13 from 217 and subtract 217 from 421 and compare the two numbers:
217 - 13 = 204
421 - 217 = 204
As you can see, the halfway number is 204 higher than 13 and 204 lower than 421. Therefore, our halfway between answer of 217 above is correct.
Halfway Between
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Halfway Between 13 and 422
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