When you ask "What number is halfway between 77 and 150?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=77 and Y=150.
To find the number halfway between 77 and 150, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 77 and 150 into our formula, we get:
(77 + 150)/2 = 113.5
Thus, the number halfway between 77 and 150 is 113.5.
To check that our answer is correct, we subtract 77 from 113.5 and subtract 113.5 from 150 and compare the two numbers:
113.5 - 77 = 36.5
150 - 113.5 = 36.5
As you can see, the halfway number is 36.5 higher than 77 and 36.5 lower than 150. Therefore, our halfway between answer of 113.5 above is correct.
Halfway Between
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Halfway Between 77 and 151
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