When you ask "What number is halfway between 98 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=98 and Y=557.
To find the number halfway between 98 and 557, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 98 and 557 into our formula, we get:
(98 + 557)/2 = 327.5
Thus, the number halfway between 98 and 557 is 327.5.
To check that our answer is correct, we subtract 98 from 327.5 and subtract 327.5 from 557 and compare the two numbers:
327.5 - 98 = 229.5
557 - 327.5 = 229.5
As you can see, the halfway number is 229.5 higher than 98 and 229.5 lower than 557. Therefore, our halfway between answer of 327.5 above is correct.
Halfway Between
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