When you ask "What number is halfway between 90 and 313?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=90 and Y=313.
To find the number halfway between 90 and 313, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 90 and 313 into our formula, we get:
(90 + 313)/2 = 201.5
Thus, the number halfway between 90 and 313 is 201.5.
To check that our answer is correct, we subtract 90 from 201.5 and subtract 201.5 from 313 and compare the two numbers:
201.5 - 90 = 111.5
313 - 201.5 = 111.5
As you can see, the halfway number is 111.5 higher than 90 and 111.5 lower than 313. Therefore, our halfway between answer of 201.5 above is correct.
Halfway Between
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Halfway Between 90 and 314
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