When you ask "What number is halfway between 99 and 355?" 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=355.
To find the number halfway between 99 and 355, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 355 into our formula, we get:
(99 + 355)/2 = 227
Thus, the number halfway between 99 and 355 is 227.
To check that our answer is correct, we subtract 99 from 227 and subtract 227 from 355 and compare the two numbers:
227 - 99 = 128
355 - 227 = 128
As you can see, the halfway number is 128 higher than 99 and 128 lower than 355. Therefore, our halfway between answer of 227 above is correct.
Halfway Between
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Halfway Between 99 and 356
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