When you ask "What number is halfway between 20 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=20 and Y=427.
To find the number halfway between 20 and 427, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 427 into our formula, we get:
(20 + 427)/2 = 223.5
Thus, the number halfway between 20 and 427 is 223.5.
To check that our answer is correct, we subtract 20 from 223.5 and subtract 223.5 from 427 and compare the two numbers:
223.5 - 20 = 203.5
427 - 223.5 = 203.5
As you can see, the halfway number is 203.5 higher than 20 and 203.5 lower than 427. Therefore, our halfway between answer of 223.5 above is correct.
Halfway Between
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Halfway Between 20 and 428
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