When you ask "What number is halfway between 21 and 412?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=21 and Y=412.
To find the number halfway between 21 and 412, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 412 into our formula, we get:
(21 + 412)/2 = 216.5
Thus, the number halfway between 21 and 412 is 216.5.
To check that our answer is correct, we subtract 21 from 216.5 and subtract 216.5 from 412 and compare the two numbers:
216.5 - 21 = 195.5
412 - 216.5 = 195.5
As you can see, the halfway number is 195.5 higher than 21 and 195.5 lower than 412. Therefore, our halfway between answer of 216.5 above is correct.
Halfway Between
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Halfway Between 21 and 413
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