When you ask "What number is halfway between 17 and 620?" 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=620.
To find the number halfway between 17 and 620, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 620 into our formula, we get:
(17 + 620)/2 = 318.5
Thus, the number halfway between 17 and 620 is 318.5.
To check that our answer is correct, we subtract 17 from 318.5 and subtract 318.5 from 620 and compare the two numbers:
318.5 - 17 = 301.5
620 - 318.5 = 301.5
As you can see, the halfway number is 301.5 higher than 17 and 301.5 lower than 620. Therefore, our halfway between answer of 318.5 above is correct.
Halfway Between
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