When you ask "What number is halfway between 21 and 430?" 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=430.
To find the number halfway between 21 and 430, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 430 into our formula, we get:
(21 + 430)/2 = 225.5
Thus, the number halfway between 21 and 430 is 225.5.
To check that our answer is correct, we subtract 21 from 225.5 and subtract 225.5 from 430 and compare the two numbers:
225.5 - 21 = 204.5
430 - 225.5 = 204.5
As you can see, the halfway number is 204.5 higher than 21 and 204.5 lower than 430. Therefore, our halfway between answer of 225.5 above is correct.
Halfway Between
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Halfway Between 21 and 431
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