When you ask "What number is halfway between 55 and 200?" 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=200.
To find the number halfway between 55 and 200, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 200 into our formula, we get:
(55 + 200)/2 = 127.5
Thus, the number halfway between 55 and 200 is 127.5.
To check that our answer is correct, we subtract 55 from 127.5 and subtract 127.5 from 200 and compare the two numbers:
127.5 - 55 = 72.5
200 - 127.5 = 72.5
As you can see, the halfway number is 72.5 higher than 55 and 72.5 lower than 200. Therefore, our halfway between answer of 127.5 above is correct.
Halfway Between
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Halfway Between 55 and 201
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