When you ask "What number is halfway between 22 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=22 and Y=421.
To find the number halfway between 22 and 421, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 22 and 421 into our formula, we get:
(22 + 421)/2 = 221.5
Thus, the number halfway between 22 and 421 is 221.5.
To check that our answer is correct, we subtract 22 from 221.5 and subtract 221.5 from 421 and compare the two numbers:
221.5 - 22 = 199.5
421 - 221.5 = 199.5
As you can see, the halfway number is 199.5 higher than 22 and 199.5 lower than 421. Therefore, our halfway between answer of 221.5 above is correct.
Halfway Between
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Halfway Between 22 and 422
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