When you ask "What number is halfway between 99 and 456?" 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=456.
To find the number halfway between 99 and 456, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 456 into our formula, we get:
(99 + 456)/2 = 277.5
Thus, the number halfway between 99 and 456 is 277.5.
To check that our answer is correct, we subtract 99 from 277.5 and subtract 277.5 from 456 and compare the two numbers:
277.5 - 99 = 178.5
456 - 277.5 = 178.5
As you can see, the halfway number is 178.5 higher than 99 and 178.5 lower than 456. Therefore, our halfway between answer of 277.5 above is correct.
Halfway Between
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Halfway Between 99 and 457
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