When you ask "What number is halfway between 84 and 625?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=84 and Y=625.
To find the number halfway between 84 and 625, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 625 into our formula, we get:
(84 + 625)/2 = 354.5
Thus, the number halfway between 84 and 625 is 354.5.
To check that our answer is correct, we subtract 84 from 354.5 and subtract 354.5 from 625 and compare the two numbers:
354.5 - 84 = 270.5
625 - 354.5 = 270.5
As you can see, the halfway number is 270.5 higher than 84 and 270.5 lower than 625. Therefore, our halfway between answer of 354.5 above is correct.
Halfway Between
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Halfway Between 84 and 626
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