When you ask "What number is halfway between 24 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=24 and Y=421.
To find the number halfway between 24 and 421, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 24 and 421 into our formula, we get:
(24 + 421)/2 = 222.5
Thus, the number halfway between 24 and 421 is 222.5.
To check that our answer is correct, we subtract 24 from 222.5 and subtract 222.5 from 421 and compare the two numbers:
222.5 - 24 = 198.5
421 - 222.5 = 198.5
As you can see, the halfway number is 198.5 higher than 24 and 198.5 lower than 421. Therefore, our halfway between answer of 222.5 above is correct.
Halfway Between
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Halfway Between 24 and 422
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