When you ask "What number is halfway between 23 and 420?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=23 and Y=420.
To find the number halfway between 23 and 420, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 23 and 420 into our formula, we get:
(23 + 420)/2 = 221.5
Thus, the number halfway between 23 and 420 is 221.5.
To check that our answer is correct, we subtract 23 from 221.5 and subtract 221.5 from 420 and compare the two numbers:
221.5 - 23 = 198.5
420 - 221.5 = 198.5
As you can see, the halfway number is 198.5 higher than 23 and 198.5 lower than 420. Therefore, our halfway between answer of 221.5 above is correct.
Halfway Between
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Halfway Between 23 and 421
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