When you ask "What number is halfway between 99 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=99 and Y=543.
To find the number halfway between 99 and 543, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 543 into our formula, we get:
(99 + 543)/2 = 321
Thus, the number halfway between 99 and 543 is 321.
To check that our answer is correct, we subtract 99 from 321 and subtract 321 from 543 and compare the two numbers:
321 - 99 = 222
543 - 321 = 222
As you can see, the halfway number is 222 higher than 99 and 222 lower than 543. Therefore, our halfway between answer of 321 above is correct.
Halfway Between
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Halfway Between 99 and 544
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