When you ask "What number is halfway between 17 and 390?" 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=390.
To find the number halfway between 17 and 390, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 390 into our formula, we get:
(17 + 390)/2 = 203.5
Thus, the number halfway between 17 and 390 is 203.5.
To check that our answer is correct, we subtract 17 from 203.5 and subtract 203.5 from 390 and compare the two numbers:
203.5 - 17 = 186.5
390 - 203.5 = 186.5
As you can see, the halfway number is 186.5 higher than 17 and 186.5 lower than 390. Therefore, our halfway between answer of 203.5 above is correct.
Halfway Between
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Halfway Between 17 and 391
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