When you ask "What number is halfway between 100 and 543?" 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=543.
To find the number halfway between 100 and 543, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 543 into our formula, we get:
(100 + 543)/2 = 321.5
Thus, the number halfway between 100 and 543 is 321.5.
To check that our answer is correct, we subtract 100 from 321.5 and subtract 321.5 from 543 and compare the two numbers:
321.5 - 100 = 221.5
543 - 321.5 = 221.5
As you can see, the halfway number is 221.5 higher than 100 and 221.5 lower than 543. Therefore, our halfway between answer of 321.5 above is correct.
Halfway Between
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Halfway Between 100 and 544
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