When you ask "What number is halfway between 21 and 644?" 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=644.
To find the number halfway between 21 and 644, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 644 into our formula, we get:
(21 + 644)/2 = 332.5
Thus, the number halfway between 21 and 644 is 332.5.
To check that our answer is correct, we subtract 21 from 332.5 and subtract 332.5 from 644 and compare the two numbers:
332.5 - 21 = 311.5
644 - 332.5 = 311.5
As you can see, the halfway number is 311.5 higher than 21 and 311.5 lower than 644. Therefore, our halfway between answer of 332.5 above is correct.
Halfway Between
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Halfway Between 21 and 645
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