When you ask "What number is halfway between 99 and 557?" 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=557.
To find the number halfway between 99 and 557, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 557 into our formula, we get:
(99 + 557)/2 = 328
Thus, the number halfway between 99 and 557 is 328.
To check that our answer is correct, we subtract 99 from 328 and subtract 328 from 557 and compare the two numbers:
328 - 99 = 229
557 - 328 = 229
As you can see, the halfway number is 229 higher than 99 and 229 lower than 557. Therefore, our halfway between answer of 328 above is correct.
Halfway Between
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