When you ask "What number is halfway between 21 and 750?" 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=750.
To find the number halfway between 21 and 750, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 750 into our formula, we get:
(21 + 750)/2 = 385.5
Thus, the number halfway between 21 and 750 is 385.5.
To check that our answer is correct, we subtract 21 from 385.5 and subtract 385.5 from 750 and compare the two numbers:
385.5 - 21 = 364.5
750 - 385.5 = 364.5
As you can see, the halfway number is 364.5 higher than 21 and 364.5 lower than 750. Therefore, our halfway between answer of 385.5 above is correct.
Halfway Between
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