When you ask "What number is halfway between 0 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=0 and Y=278.
To find the number halfway between 0 and 278, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 0 and 278 into our formula, we get:
(0 + 278)/2 = 139
Thus, the number halfway between 0 and 278 is 139.
To check that our answer is correct, we subtract 0 from 139 and subtract 139 from 278 and compare the two numbers:
139 - 0 = 139
278 - 139 = 139
As you can see, the halfway number is 139 higher than 0 and 139 lower than 278. Therefore, our halfway between answer of 139 above is correct.
Halfway Between
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Halfway Between 0 and 279
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