When you ask "What number is halfway between 21 and 736?" 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=736.
To find the number halfway between 21 and 736, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 736 into our formula, we get:
(21 + 736)/2 = 378.5
Thus, the number halfway between 21 and 736 is 378.5.
To check that our answer is correct, we subtract 21 from 378.5 and subtract 378.5 from 736 and compare the two numbers:
378.5 - 21 = 357.5
736 - 378.5 = 357.5
As you can see, the halfway number is 357.5 higher than 21 and 357.5 lower than 736. Therefore, our halfway between answer of 378.5 above is correct.
Halfway Between
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Halfway Between 21 and 737
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