When you ask "What number is halfway between 77 and 143?" 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=143.
To find the number halfway between 77 and 143, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 77 and 143 into our formula, we get:
(77 + 143)/2 = 110
Thus, the number halfway between 77 and 143 is 110.
To check that our answer is correct, we subtract 77 from 110 and subtract 110 from 143 and compare the two numbers:
110 - 77 = 33
143 - 110 = 33
As you can see, the halfway number is 33 higher than 77 and 33 lower than 143. Therefore, our halfway between answer of 110 above is correct.
Halfway Between
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Halfway Between 77 and 144
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