When you ask "What number is halfway between 21 and 405?" 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=405.
To find the number halfway between 21 and 405, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 405 into our formula, we get:
(21 + 405)/2 = 213
Thus, the number halfway between 21 and 405 is 213.
To check that our answer is correct, we subtract 21 from 213 and subtract 213 from 405 and compare the two numbers:
213 - 21 = 192
405 - 213 = 192
As you can see, the halfway number is 192 higher than 21 and 192 lower than 405. Therefore, our halfway between answer of 213 above is correct.
Halfway Between
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Halfway Between 21 and 406
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