When you ask "What number is halfway between 30 and 631?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=30 and Y=631.
To find the number halfway between 30 and 631, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 631 into our formula, we get:
(30 + 631)/2 = 330.5
Thus, the number halfway between 30 and 631 is 330.5.
To check that our answer is correct, we subtract 30 from 330.5 and subtract 330.5 from 631 and compare the two numbers:
330.5 - 30 = 300.5
631 - 330.5 = 300.5
As you can see, the halfway number is 300.5 higher than 30 and 300.5 lower than 631. Therefore, our halfway between answer of 330.5 above is correct.
Halfway Between
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Halfway Between 30 and 632
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