When you ask "What number is halfway between 21 and 640?" 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=640.
To find the number halfway between 21 and 640, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 640 into our formula, we get:
(21 + 640)/2 = 330.5
Thus, the number halfway between 21 and 640 is 330.5.
To check that our answer is correct, we subtract 21 from 330.5 and subtract 330.5 from 640 and compare the two numbers:
330.5 - 21 = 309.5
640 - 330.5 = 309.5
As you can see, the halfway number is 309.5 higher than 21 and 309.5 lower than 640. Therefore, our halfway between answer of 330.5 above is correct.
Halfway Between
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