When you ask "What number is halfway between 4 and 275?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=4 and Y=275.
To find the number halfway between 4 and 275, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 275 into our formula, we get:
(4 + 275)/2 = 139.5
Thus, the number halfway between 4 and 275 is 139.5.
To check that our answer is correct, we subtract 4 from 139.5 and subtract 139.5 from 275 and compare the two numbers:
139.5 - 4 = 135.5
275 - 139.5 = 135.5
As you can see, the halfway number is 135.5 higher than 4 and 135.5 lower than 275. Therefore, our halfway between answer of 139.5 above is correct.
Halfway Between
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Halfway Between 4 and 276
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