When you ask "What number is halfway between 10 and 621?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=10 and Y=621.
To find the number halfway between 10 and 621, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 10 and 621 into our formula, we get:
(10 + 621)/2 = 315.5
Thus, the number halfway between 10 and 621 is 315.5.
To check that our answer is correct, we subtract 10 from 315.5 and subtract 315.5 from 621 and compare the two numbers:
315.5 - 10 = 305.5
621 - 315.5 = 305.5
As you can see, the halfway number is 305.5 higher than 10 and 305.5 lower than 621. Therefore, our halfway between answer of 315.5 above is correct.
Halfway Between
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Halfway Between 10 and 622
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