When you ask "What number is halfway between 11 and 628?" 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=628.
To find the number halfway between 11 and 628, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 628 into our formula, we get:
(11 + 628)/2 = 319.5
Thus, the number halfway between 11 and 628 is 319.5.
To check that our answer is correct, we subtract 11 from 319.5 and subtract 319.5 from 628 and compare the two numbers:
319.5 - 11 = 308.5
628 - 319.5 = 308.5
As you can see, the halfway number is 308.5 higher than 11 and 308.5 lower than 628. Therefore, our halfway between answer of 319.5 above is correct.
Halfway Between
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Halfway Between 11 and 629
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