When you ask "What number is halfway between 63 and 90?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=63 and Y=90.
To find the number halfway between 63 and 90, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 63 and 90 into our formula, we get:
(63 + 90)/2 = 76.5
Thus, the number halfway between 63 and 90 is 76.5.
To check that our answer is correct, we subtract 63 from 76.5 and subtract 76.5 from 90 and compare the two numbers:
76.5 - 63 = 13.5
90 - 76.5 = 13.5
As you can see, the halfway number is 13.5 higher than 63 and 13.5 lower than 90. Therefore, our halfway between answer of 76.5 above is correct.
Halfway Between
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Halfway Between 63 and 91
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