When you ask "What number is halfway between 21 and 427?" 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=427.
To find the number halfway between 21 and 427, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 427 into our formula, we get:
(21 + 427)/2 = 224
Thus, the number halfway between 21 and 427 is 224.
To check that our answer is correct, we subtract 21 from 224 and subtract 224 from 427 and compare the two numbers:
224 - 21 = 203
427 - 224 = 203
As you can see, the halfway number is 203 higher than 21 and 203 lower than 427. Therefore, our halfway between answer of 224 above is correct.
Halfway Between
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Halfway Between 21 and 428
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