When you ask "What number is halfway between 21 and 438?" 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=438.
To find the number halfway between 21 and 438, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 438 into our formula, we get:
(21 + 438)/2 = 229.5
Thus, the number halfway between 21 and 438 is 229.5.
To check that our answer is correct, we subtract 21 from 229.5 and subtract 229.5 from 438 and compare the two numbers:
229.5 - 21 = 208.5
438 - 229.5 = 208.5
As you can see, the halfway number is 208.5 higher than 21 and 208.5 lower than 438. Therefore, our halfway between answer of 229.5 above is correct.
Halfway Between
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Halfway Between 21 and 439
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