When you ask "What number is halfway between 99 and 624?" 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=624.
To find the number halfway between 99 and 624, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 624 into our formula, we get:
(99 + 624)/2 = 361.5
Thus, the number halfway between 99 and 624 is 361.5.
To check that our answer is correct, we subtract 99 from 361.5 and subtract 361.5 from 624 and compare the two numbers:
361.5 - 99 = 262.5
624 - 361.5 = 262.5
As you can see, the halfway number is 262.5 higher than 99 and 262.5 lower than 624. Therefore, our halfway between answer of 361.5 above is correct.
Halfway Between
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Halfway Between 99 and 625
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