When you ask "What number is halfway between 9 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=9 and Y=420.
To find the number halfway between 9 and 420, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 420 into our formula, we get:
(9 + 420)/2 = 214.5
Thus, the number halfway between 9 and 420 is 214.5.
To check that our answer is correct, we subtract 9 from 214.5 and subtract 214.5 from 420 and compare the two numbers:
214.5 - 9 = 205.5
420 - 214.5 = 205.5
As you can see, the halfway number is 205.5 higher than 9 and 205.5 lower than 420. Therefore, our halfway between answer of 214.5 above is correct.
Halfway Between
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Halfway Between 9 and 421
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