When you ask "What number is halfway between 99 and 486?" 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=486.
To find the number halfway between 99 and 486, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 486 into our formula, we get:
(99 + 486)/2 = 292.5
Thus, the number halfway between 99 and 486 is 292.5.
To check that our answer is correct, we subtract 99 from 292.5 and subtract 292.5 from 486 and compare the two numbers:
292.5 - 99 = 193.5
486 - 292.5 = 193.5
As you can see, the halfway number is 193.5 higher than 99 and 193.5 lower than 486. Therefore, our halfway between answer of 292.5 above is correct.
Halfway Between
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Halfway Between 99 and 487
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