When you ask "What number is halfway between 3 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=3 and Y=90.
To find the number halfway between 3 and 90, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 3 and 90 into our formula, we get:
(3 + 90)/2 = 46.5
Thus, the number halfway between 3 and 90 is 46.5.
To check that our answer is correct, we subtract 3 from 46.5 and subtract 46.5 from 90 and compare the two numbers:
46.5 - 3 = 43.5
90 - 46.5 = 43.5
As you can see, the halfway number is 43.5 higher than 3 and 43.5 lower than 90. Therefore, our halfway between answer of 46.5 above is correct.
Halfway Between
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Halfway Between 3 and 91
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