When you ask "What number is halfway between 99 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=99 and Y=507.
To find the number halfway between 99 and 507, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 507 into our formula, we get:
(99 + 507)/2 = 303
Thus, the number halfway between 99 and 507 is 303.
To check that our answer is correct, we subtract 99 from 303 and subtract 303 from 507 and compare the two numbers:
303 - 99 = 204
507 - 303 = 204
As you can see, the halfway number is 204 higher than 99 and 204 lower than 507. Therefore, our halfway between answer of 303 above is correct.
Halfway Between
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Halfway Between 99 and 508
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