When you ask "What number is halfway between 99 and 484?" 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=484.
To find the number halfway between 99 and 484, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 484 into our formula, we get:
(99 + 484)/2 = 291.5
Thus, the number halfway between 99 and 484 is 291.5.
To check that our answer is correct, we subtract 99 from 291.5 and subtract 291.5 from 484 and compare the two numbers:
291.5 - 99 = 192.5
484 - 291.5 = 192.5
As you can see, the halfway number is 192.5 higher than 99 and 192.5 lower than 484. Therefore, our halfway between answer of 291.5 above is correct.
Halfway Between
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Halfway Between 99 and 485
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