When you ask "What number is halfway between 55 and 121?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=55 and Y=121.
To find the number halfway between 55 and 121, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 121 into our formula, we get:
(55 + 121)/2 = 88
Thus, the number halfway between 55 and 121 is 88.
To check that our answer is correct, we subtract 55 from 88 and subtract 88 from 121 and compare the two numbers:
88 - 55 = 33
121 - 88 = 33
As you can see, the halfway number is 33 higher than 55 and 33 lower than 121. Therefore, our halfway between answer of 88 above is correct.
Halfway Between
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Halfway Between 55 and 122
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