When you ask "What number is halfway between 22 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=22 and Y=90.
To find the number halfway between 22 and 90, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 22 and 90 into our formula, we get:
(22 + 90)/2 = 56
Thus, the number halfway between 22 and 90 is 56.
To check that our answer is correct, we subtract 22 from 56 and subtract 56 from 90 and compare the two numbers:
56 - 22 = 34
90 - 56 = 34
As you can see, the halfway number is 34 higher than 22 and 34 lower than 90. Therefore, our halfway between answer of 56 above is correct.
Halfway Between
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Halfway Between 22 and 91
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