When you ask "What number is halfway between 7 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=7 and Y=278.
To find the number halfway between 7 and 278, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 278 into our formula, we get:
(7 + 278)/2 = 142.5
Thus, the number halfway between 7 and 278 is 142.5.
To check that our answer is correct, we subtract 7 from 142.5 and subtract 142.5 from 278 and compare the two numbers:
142.5 - 7 = 135.5
278 - 142.5 = 135.5
As you can see, the halfway number is 135.5 higher than 7 and 135.5 lower than 278. Therefore, our halfway between answer of 142.5 above is correct.
Halfway Between
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Halfway Between 7 and 279
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