When you ask "What number is halfway between 18 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=18 and Y=280.
To find the number halfway between 18 and 280, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 280 into our formula, we get:
(18 + 280)/2 = 149
Thus, the number halfway between 18 and 280 is 149.
To check that our answer is correct, we subtract 18 from 149 and subtract 149 from 280 and compare the two numbers:
149 - 18 = 131
280 - 149 = 131
As you can see, the halfway number is 131 higher than 18 and 131 lower than 280. Therefore, our halfway between answer of 149 above is correct.
Halfway Between
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Halfway Between 18 and 281
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