When you ask "What number is halfway between 100 and 577?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=100 and Y=577.
To find the number halfway between 100 and 577, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 577 into our formula, we get:
(100 + 577)/2 = 338.5
Thus, the number halfway between 100 and 577 is 338.5.
To check that our answer is correct, we subtract 100 from 338.5 and subtract 338.5 from 577 and compare the two numbers:
338.5 - 100 = 238.5
577 - 338.5 = 238.5
As you can see, the halfway number is 238.5 higher than 100 and 238.5 lower than 577. Therefore, our halfway between answer of 338.5 above is correct.
Halfway Between
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Halfway Between 100 and 578
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