When you ask "What number is halfway between 77 and 98?" 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=98.
To find the number halfway between 77 and 98, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 77 and 98 into our formula, we get:
(77 + 98)/2 = 87.5
Thus, the number halfway between 77 and 98 is 87.5.
To check that our answer is correct, we subtract 77 from 87.5 and subtract 87.5 from 98 and compare the two numbers:
87.5 - 77 = 10.5
98 - 87.5 = 10.5
As you can see, the halfway number is 10.5 higher than 77 and 10.5 lower than 98. Therefore, our halfway between answer of 87.5 above is correct.
Halfway Between
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Halfway Between 77 and 99
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