
When you ask "What number is halfway between 55 and 153?" 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=153.

To find the number halfway between 55 and 153, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 153 into our formula, we get:
(55 + 153)/2 = 104
Thus, the number halfway between 55 and 153 is 104.
To check that our answer is correct, we subtract 55 from 104 and subtract 104 from 153 and compare the two numbers:
104 - 55 = 49
153 - 104 = 49
As you can see, the halfway number is 49 higher than 55 and 49 lower than 153. Therefore, our halfway between answer of 104 above is correct.
Halfway Between
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Halfway Between 55 and 154
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