When you ask "What number is halfway between 31 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=31 and Y=620.
To find the number halfway between 31 and 620, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 620 into our formula, we get:
(31 + 620)/2 = 325.5
Thus, the number halfway between 31 and 620 is 325.5.
To check that our answer is correct, we subtract 31 from 325.5 and subtract 325.5 from 620 and compare the two numbers:
325.5 - 31 = 294.5
620 - 325.5 = 294.5
As you can see, the halfway number is 294.5 higher than 31 and 294.5 lower than 620. Therefore, our halfway between answer of 325.5 above is correct.
Halfway Between
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