When you ask "What number is halfway between 1 and 277?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=1 and Y=277.
To find the number halfway between 1 and 277, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 1 and 277 into our formula, we get:
(1 + 277)/2 = 139
Thus, the number halfway between 1 and 277 is 139.
To check that our answer is correct, we subtract 1 from 139 and subtract 139 from 277 and compare the two numbers:
139 - 1 = 138
277 - 139 = 138
As you can see, the halfway number is 138 higher than 1 and 138 lower than 277. Therefore, our halfway between answer of 139 above is correct.
Halfway Between
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Halfway Between 1 and 278
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