When you ask "What number is halfway between 51 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=51 and Y=122.
To find the number halfway between 51 and 122, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 122 into our formula, we get:
(51 + 122)/2 = 86.5
Thus, the number halfway between 51 and 122 is 86.5.
To check that our answer is correct, we subtract 51 from 86.5 and subtract 86.5 from 122 and compare the two numbers:
86.5 - 51 = 35.5
122 - 86.5 = 35.5
As you can see, the halfway number is 35.5 higher than 51 and 35.5 lower than 122. Therefore, our halfway between answer of 86.5 above is correct.
Halfway Between
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Halfway Between 51 and 123
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