When you ask "What number is halfway between 0 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=0 and Y=421.
To find the number halfway between 0 and 421, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 0 and 421 into our formula, we get:
(0 + 421)/2 = 210.5
Thus, the number halfway between 0 and 421 is 210.5.
To check that our answer is correct, we subtract 0 from 210.5 and subtract 210.5 from 421 and compare the two numbers:
210.5 - 0 = 210.5
421 - 210.5 = 210.5
As you can see, the halfway number is 210.5 higher than 0 and 210.5 lower than 421. Therefore, our halfway between answer of 210.5 above is correct.
Halfway Between
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Halfway Between 0 and 422
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