When you ask "What number is halfway between 21 and 768?" 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=768.
To find the number halfway between 21 and 768, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 768 into our formula, we get:
(21 + 768)/2 = 394.5
Thus, the number halfway between 21 and 768 is 394.5.
To check that our answer is correct, we subtract 21 from 394.5 and subtract 394.5 from 768 and compare the two numbers:
394.5 - 21 = 373.5
768 - 394.5 = 373.5
As you can see, the halfway number is 373.5 higher than 21 and 373.5 lower than 768. Therefore, our halfway between answer of 394.5 above is correct.
Halfway Between
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Halfway Between 21 and 769
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