When you ask "What number is halfway between 42 and 77?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=42 and Y=77.
To find the number halfway between 42 and 77, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 77 into our formula, we get:
(42 + 77)/2 = 59.5
Thus, the number halfway between 42 and 77 is 59.5.
To check that our answer is correct, we subtract 42 from 59.5 and subtract 59.5 from 77 and compare the two numbers:
59.5 - 42 = 17.5
77 - 59.5 = 17.5
As you can see, the halfway number is 17.5 higher than 42 and 17.5 lower than 77. Therefore, our halfway between answer of 59.5 above is correct.
Halfway Between
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Halfway Between 42 and 78
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