When you ask "What number is halfway between 17 and 621?" 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=621.
To find the number halfway between 17 and 621, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 621 into our formula, we get:
(17 + 621)/2 = 319
Thus, the number halfway between 17 and 621 is 319.
To check that our answer is correct, we subtract 17 from 319 and subtract 319 from 621 and compare the two numbers:
319 - 17 = 302
621 - 319 = 302
As you can see, the halfway number is 302 higher than 17 and 302 lower than 621. Therefore, our halfway between answer of 319 above is correct.
Halfway Between
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Halfway Between 17 and 622
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