When you ask "What number is halfway between 77 and 154?" 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=154.
To find the number halfway between 77 and 154, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 77 and 154 into our formula, we get:
(77 + 154)/2 = 115.5
Thus, the number halfway between 77 and 154 is 115.5.
To check that our answer is correct, we subtract 77 from 115.5 and subtract 115.5 from 154 and compare the two numbers:
115.5 - 77 = 38.5
154 - 115.5 = 38.5
As you can see, the halfway number is 38.5 higher than 77 and 38.5 lower than 154. Therefore, our halfway between answer of 115.5 above is correct.
Halfway Between
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Halfway Between 77 and 155
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