When you ask "What number is halfway between 17 and 90?" 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=90.
To find the number halfway between 17 and 90, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 90 into our formula, we get:
(17 + 90)/2 = 53.5
Thus, the number halfway between 17 and 90 is 53.5.
To check that our answer is correct, we subtract 17 from 53.5 and subtract 53.5 from 90 and compare the two numbers:
53.5 - 17 = 36.5
90 - 53.5 = 36.5
As you can see, the halfway number is 36.5 higher than 17 and 36.5 lower than 90. Therefore, our halfway between answer of 53.5 above is correct.
Halfway Between
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Halfway Between 17 and 91
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