
When you ask "What number is halfway between 90 and 122?" 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=122.

To find the number halfway between 90 and 122, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 90 and 122 into our formula, we get:
(90 + 122)/2 = 106
Thus, the number halfway between 90 and 122 is 106.
To check that our answer is correct, we subtract 90 from 106 and subtract 106 from 122 and compare the two numbers:
106 - 90 = 16
122 - 106 = 16
As you can see, the halfway number is 16 higher than 90 and 16 lower than 122. Therefore, our halfway between answer of 106 above is correct.
Halfway Between
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Halfway Between 90 and 123
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