When you ask "What number is halfway between 11 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=11 and Y=280.
To find the number halfway between 11 and 280, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 280 into our formula, we get:
(11 + 280)/2 = 145.5
Thus, the number halfway between 11 and 280 is 145.5.
To check that our answer is correct, we subtract 11 from 145.5 and subtract 145.5 from 280 and compare the two numbers:
145.5 - 11 = 134.5
280 - 145.5 = 134.5
As you can see, the halfway number is 134.5 higher than 11 and 134.5 lower than 280. Therefore, our halfway between answer of 145.5 above is correct.
Halfway Between
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Halfway Between 11 and 281
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