When you ask "What number is halfway between 7 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=7 and Y=122.
To find the number halfway between 7 and 122, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 122 into our formula, we get:
(7 + 122)/2 = 64.5
Thus, the number halfway between 7 and 122 is 64.5.
To check that our answer is correct, we subtract 7 from 64.5 and subtract 64.5 from 122 and compare the two numbers:
64.5 - 7 = 57.5
122 - 64.5 = 57.5
As you can see, the halfway number is 57.5 higher than 7 and 57.5 lower than 122. Therefore, our halfway between answer of 64.5 above is correct.
Halfway Between
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Halfway Between 7 and 123
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