When you ask "What number is halfway between 18 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=18 and Y=625.
To find the number halfway between 18 and 625, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 625 into our formula, we get:
(18 + 625)/2 = 321.5
Thus, the number halfway between 18 and 625 is 321.5.
To check that our answer is correct, we subtract 18 from 321.5 and subtract 321.5 from 625 and compare the two numbers:
321.5 - 18 = 303.5
625 - 321.5 = 303.5
As you can see, the halfway number is 303.5 higher than 18 and 303.5 lower than 625. Therefore, our halfway between answer of 321.5 above is correct.
Halfway Between
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Halfway Between 18 and 626
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