When you ask "What number is halfway between 21 and 364?" 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=364.
To find the number halfway between 21 and 364, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 364 into our formula, we get:
(21 + 364)/2 = 192.5
Thus, the number halfway between 21 and 364 is 192.5.
To check that our answer is correct, we subtract 21 from 192.5 and subtract 192.5 from 364 and compare the two numbers:
192.5 - 21 = 171.5
364 - 192.5 = 171.5
As you can see, the halfway number is 171.5 higher than 21 and 171.5 lower than 364. Therefore, our halfway between answer of 192.5 above is correct.
Halfway Between
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Halfway Between 21 and 365
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