When you ask "What number is halfway between 99 and 531?" 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=531.
To find the number halfway between 99 and 531, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 531 into our formula, we get:
(99 + 531)/2 = 315
Thus, the number halfway between 99 and 531 is 315.
To check that our answer is correct, we subtract 99 from 315 and subtract 315 from 531 and compare the two numbers:
315 - 99 = 216
531 - 315 = 216
As you can see, the halfway number is 216 higher than 99 and 216 lower than 531. Therefore, our halfway between answer of 315 above is correct.
Halfway Between
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Halfway Between 99 and 532
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