When you ask "What number is halfway between 17 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=17 and Y=420.
To find the number halfway between 17 and 420, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 420 into our formula, we get:
(17 + 420)/2 = 218.5
Thus, the number halfway between 17 and 420 is 218.5.
To check that our answer is correct, we subtract 17 from 218.5 and subtract 218.5 from 420 and compare the two numbers:
218.5 - 17 = 201.5
420 - 218.5 = 201.5
As you can see, the halfway number is 201.5 higher than 17 and 201.5 lower than 420. Therefore, our halfway between answer of 218.5 above is correct.
Halfway Between
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Halfway Between 17 and 421
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