When you ask "What number is halfway between 77 and 155?" 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=155.
To find the number halfway between 77 and 155, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 77 and 155 into our formula, we get:
(77 + 155)/2 = 116
Thus, the number halfway between 77 and 155 is 116.
To check that our answer is correct, we subtract 77 from 116 and subtract 116 from 155 and compare the two numbers:
116 - 77 = 39
155 - 116 = 39
As you can see, the halfway number is 39 higher than 77 and 39 lower than 155. Therefore, our halfway between answer of 116 above is correct.
Halfway Between
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Halfway Between 77 and 156
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