When you ask "What number is halfway between 84 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=84 and Y=122.
To find the number halfway between 84 and 122, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 122 into our formula, we get:
(84 + 122)/2 = 103
Thus, the number halfway between 84 and 122 is 103.
To check that our answer is correct, we subtract 84 from 103 and subtract 103 from 122 and compare the two numbers:
103 - 84 = 19
122 - 103 = 19
As you can see, the halfway number is 19 higher than 84 and 19 lower than 122. Therefore, our halfway between answer of 103 above is correct.
Halfway Between
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Halfway Between 84 and 123
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