When you ask "What number is halfway between 67 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=67 and Y=90.
To find the number halfway between 67 and 90, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 67 and 90 into our formula, we get:
(67 + 90)/2 = 78.5
Thus, the number halfway between 67 and 90 is 78.5.
To check that our answer is correct, we subtract 67 from 78.5 and subtract 78.5 from 90 and compare the two numbers:
78.5 - 67 = 11.5
90 - 78.5 = 11.5
As you can see, the halfway number is 11.5 higher than 67 and 11.5 lower than 90. Therefore, our halfway between answer of 78.5 above is correct.
Halfway Between
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Halfway Between 67 and 91
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