When you ask "What number is halfway between 21 and 738?" 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=738.
To find the number halfway between 21 and 738, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 738 into our formula, we get:
(21 + 738)/2 = 379.5
Thus, the number halfway between 21 and 738 is 379.5.
To check that our answer is correct, we subtract 21 from 379.5 and subtract 379.5 from 738 and compare the two numbers:
379.5 - 21 = 358.5
738 - 379.5 = 358.5
As you can see, the halfway number is 358.5 higher than 21 and 358.5 lower than 738. Therefore, our halfway between answer of 379.5 above is correct.
Halfway Between
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Halfway Between 21 and 739
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