When you ask "What number is halfway between 17 and 624?" 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=624.
To find the number halfway between 17 and 624, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 624 into our formula, we get:
(17 + 624)/2 = 320.5
Thus, the number halfway between 17 and 624 is 320.5.
To check that our answer is correct, we subtract 17 from 320.5 and subtract 320.5 from 624 and compare the two numbers:
320.5 - 17 = 303.5
624 - 320.5 = 303.5
As you can see, the halfway number is 303.5 higher than 17 and 303.5 lower than 624. Therefore, our halfway between answer of 320.5 above is correct.
Halfway Between
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Halfway Between 17 and 625
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