When you ask "What number is halfway between 77 and 135?" 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=135.
To find the number halfway between 77 and 135, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 77 and 135 into our formula, we get:
(77 + 135)/2 = 106
Thus, the number halfway between 77 and 135 is 106.
To check that our answer is correct, we subtract 77 from 106 and subtract 106 from 135 and compare the two numbers:
106 - 77 = 29
135 - 106 = 29
As you can see, the halfway number is 29 higher than 77 and 29 lower than 135. Therefore, our halfway between answer of 106 above is correct.
Halfway Between
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Halfway Between 77 and 136
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