When you ask "What number is halfway between 99 and 542?" 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=542.
To find the number halfway between 99 and 542, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 542 into our formula, we get:
(99 + 542)/2 = 320.5
Thus, the number halfway between 99 and 542 is 320.5.
To check that our answer is correct, we subtract 99 from 320.5 and subtract 320.5 from 542 and compare the two numbers:
320.5 - 99 = 221.5
542 - 320.5 = 221.5
As you can see, the halfway number is 221.5 higher than 99 and 221.5 lower than 542. Therefore, our halfway between answer of 320.5 above is correct.
Halfway Between
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Halfway Between 99 and 543
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