When you ask "What number is halfway between 77 and 358?" 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=358.
To find the number halfway between 77 and 358, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 77 and 358 into our formula, we get:
(77 + 358)/2 = 217.5
Thus, the number halfway between 77 and 358 is 217.5.
To check that our answer is correct, we subtract 77 from 217.5 and subtract 217.5 from 358 and compare the two numbers:
217.5 - 77 = 140.5
358 - 217.5 = 140.5
As you can see, the halfway number is 140.5 higher than 77 and 140.5 lower than 358. Therefore, our halfway between answer of 217.5 above is correct.
Halfway Between
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Halfway Between 77 and 359
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