When you ask "What number is halfway between 9 and 278?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=9 and Y=278.
To find the number halfway between 9 and 278, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 278 into our formula, we get:
(9 + 278)/2 = 143.5
Thus, the number halfway between 9 and 278 is 143.5.
To check that our answer is correct, we subtract 9 from 143.5 and subtract 143.5 from 278 and compare the two numbers:
143.5 - 9 = 134.5
278 - 143.5 = 134.5
As you can see, the halfway number is 134.5 higher than 9 and 134.5 lower than 278. Therefore, our halfway between answer of 143.5 above is correct.
Halfway Between
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Halfway Between 9 and 279
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