When you ask "What number is halfway between 30 and 507?" 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=507.
To find the number halfway between 30 and 507, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 507 into our formula, we get:
(30 + 507)/2 = 268.5
Thus, the number halfway between 30 and 507 is 268.5.
To check that our answer is correct, we subtract 30 from 268.5 and subtract 268.5 from 507 and compare the two numbers:
268.5 - 30 = 238.5
507 - 268.5 = 238.5
As you can see, the halfway number is 238.5 higher than 30 and 238.5 lower than 507. Therefore, our halfway between answer of 268.5 above is correct.
Halfway Between
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Halfway Between 30 and 508
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