When you ask "What number is halfway between 25 and 620?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=25 and Y=620.
To find the number halfway between 25 and 620, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 620 into our formula, we get:
(25 + 620)/2 = 322.5
Thus, the number halfway between 25 and 620 is 322.5.
To check that our answer is correct, we subtract 25 from 322.5 and subtract 322.5 from 620 and compare the two numbers:
322.5 - 25 = 297.5
620 - 322.5 = 297.5
As you can see, the halfway number is 297.5 higher than 25 and 297.5 lower than 620. Therefore, our halfway between answer of 322.5 above is correct.
Halfway Between
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