When you ask "What number is halfway between 55 and 251?" 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=251.
To find the number halfway between 55 and 251, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 251 into our formula, we get:
(55 + 251)/2 = 153
Thus, the number halfway between 55 and 251 is 153.
To check that our answer is correct, we subtract 55 from 153 and subtract 153 from 251 and compare the two numbers:
153 - 55 = 98
251 - 153 = 98
As you can see, the halfway number is 98 higher than 55 and 98 lower than 251. Therefore, our halfway between answer of 153 above is correct.
Halfway Between
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Halfway Between 55 and 252
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