When you ask "What number is halfway between 17 and 790?" 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=790.
To find the number halfway between 17 and 790, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 790 into our formula, we get:
(17 + 790)/2 = 403.5
Thus, the number halfway between 17 and 790 is 403.5.
To check that our answer is correct, we subtract 17 from 403.5 and subtract 403.5 from 790 and compare the two numbers:
403.5 - 17 = 386.5
790 - 403.5 = 386.5
As you can see, the halfway number is 386.5 higher than 17 and 386.5 lower than 790. Therefore, our halfway between answer of 403.5 above is correct.
Halfway Between
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Halfway Between 17 and 791
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