When you ask "What number is halfway between 83 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=83 and Y=420.
To find the number halfway between 83 and 420, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 83 and 420 into our formula, we get:
(83 + 420)/2 = 251.5
Thus, the number halfway between 83 and 420 is 251.5.
To check that our answer is correct, we subtract 83 from 251.5 and subtract 251.5 from 420 and compare the two numbers:
251.5 - 83 = 168.5
420 - 251.5 = 168.5
As you can see, the halfway number is 168.5 higher than 83 and 168.5 lower than 420. Therefore, our halfway between answer of 251.5 above is correct.
Halfway Between
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Halfway Between 83 and 421
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