When you ask "What number is halfway between 18 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=18 and Y=278.
To find the number halfway between 18 and 278, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 278 into our formula, we get:
(18 + 278)/2 = 148
Thus, the number halfway between 18 and 278 is 148.
To check that our answer is correct, we subtract 18 from 148 and subtract 148 from 278 and compare the two numbers:
148 - 18 = 130
278 - 148 = 130
As you can see, the halfway number is 130 higher than 18 and 130 lower than 278. Therefore, our halfway between answer of 148 above is correct.
Halfway Between
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Halfway Between 18 and 279
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