When you ask "What number is halfway between 11 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=11 and Y=620.
To find the number halfway between 11 and 620, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 620 into our formula, we get:
(11 + 620)/2 = 315.5
Thus, the number halfway between 11 and 620 is 315.5.
To check that our answer is correct, we subtract 11 from 315.5 and subtract 315.5 from 620 and compare the two numbers:
315.5 - 11 = 304.5
620 - 315.5 = 304.5
As you can see, the halfway number is 304.5 higher than 11 and 304.5 lower than 620. Therefore, our halfway between answer of 315.5 above is correct.
Halfway Between
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