When you ask "What number is halfway between 99 and 280?" 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=280.
To find the number halfway between 99 and 280, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 280 into our formula, we get:
(99 + 280)/2 = 189.5
Thus, the number halfway between 99 and 280 is 189.5.
To check that our answer is correct, we subtract 99 from 189.5 and subtract 189.5 from 280 and compare the two numbers:
189.5 - 99 = 90.5
280 - 189.5 = 90.5
As you can see, the halfway number is 90.5 higher than 99 and 90.5 lower than 280. Therefore, our halfway between answer of 189.5 above is correct.
Halfway Between
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Halfway Between 99 and 281
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