When you ask "What number is halfway between 21 and 938?" 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=938.
To find the number halfway between 21 and 938, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 938 into our formula, we get:
(21 + 938)/2 = 479.5
Thus, the number halfway between 21 and 938 is 479.5.
To check that our answer is correct, we subtract 21 from 479.5 and subtract 479.5 from 938 and compare the two numbers:
479.5 - 21 = 458.5
938 - 479.5 = 458.5
As you can see, the halfway number is 458.5 higher than 21 and 458.5 lower than 938. Therefore, our halfway between answer of 479.5 above is correct.
Halfway Between
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Halfway Between 21 and 939
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