When you ask "What number is halfway between 17 and 528?" 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=528.
To find the number halfway between 17 and 528, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 528 into our formula, we get:
(17 + 528)/2 = 272.5
Thus, the number halfway between 17 and 528 is 272.5.
To check that our answer is correct, we subtract 17 from 272.5 and subtract 272.5 from 528 and compare the two numbers:
272.5 - 17 = 255.5
528 - 272.5 = 255.5
As you can see, the halfway number is 255.5 higher than 17 and 255.5 lower than 528. Therefore, our halfway between answer of 272.5 above is correct.
Halfway Between
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Halfway Between 17 and 529
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