When you ask "What number is halfway between 55 and 203?" 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=203.
To find the number halfway between 55 and 203, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 203 into our formula, we get:
(55 + 203)/2 = 129
Thus, the number halfway between 55 and 203 is 129.
To check that our answer is correct, we subtract 55 from 129 and subtract 129 from 203 and compare the two numbers:
129 - 55 = 74
203 - 129 = 74
As you can see, the halfway number is 74 higher than 55 and 74 lower than 203. Therefore, our halfway between answer of 129 above is correct.
Halfway Between
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Halfway Between 55 and 204
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