When you ask "What number is halfway between 21 and 428?" 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=428.
To find the number halfway between 21 and 428, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 428 into our formula, we get:
(21 + 428)/2 = 224.5
Thus, the number halfway between 21 and 428 is 224.5.
To check that our answer is correct, we subtract 21 from 224.5 and subtract 224.5 from 428 and compare the two numbers:
224.5 - 21 = 203.5
428 - 224.5 = 203.5
As you can see, the halfway number is 203.5 higher than 21 and 203.5 lower than 428. Therefore, our halfway between answer of 224.5 above is correct.
Halfway Between
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Halfway Between 21 and 429
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