When you ask "What number is halfway between 17 and 628?" 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=628.
To find the number halfway between 17 and 628, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 628 into our formula, we get:
(17 + 628)/2 = 322.5
Thus, the number halfway between 17 and 628 is 322.5.
To check that our answer is correct, we subtract 17 from 322.5 and subtract 322.5 from 628 and compare the two numbers:
322.5 - 17 = 305.5
628 - 322.5 = 305.5
As you can see, the halfway number is 305.5 higher than 17 and 305.5 lower than 628. Therefore, our halfway between answer of 322.5 above is correct.
Halfway Between
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Halfway Between 17 and 629
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