When you ask "What number is halfway between 85 and 634?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=85 and Y=634.
To find the number halfway between 85 and 634, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 85 and 634 into our formula, we get:
(85 + 634)/2 = 359.5
Thus, the number halfway between 85 and 634 is 359.5.
To check that our answer is correct, we subtract 85 from 359.5 and subtract 359.5 from 634 and compare the two numbers:
359.5 - 85 = 274.5
634 - 359.5 = 274.5
As you can see, the halfway number is 274.5 higher than 85 and 274.5 lower than 634. Therefore, our halfway between answer of 359.5 above is correct.
Halfway Between
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Halfway Between 85 and 635
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