When you ask "What number is halfway between 55 and 288?" 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=288.
To find the number halfway between 55 and 288, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 288 into our formula, we get:
(55 + 288)/2 = 171.5
Thus, the number halfway between 55 and 288 is 171.5.
To check that our answer is correct, we subtract 55 from 171.5 and subtract 171.5 from 288 and compare the two numbers:
171.5 - 55 = 116.5
288 - 171.5 = 116.5
As you can see, the halfway number is 116.5 higher than 55 and 116.5 lower than 288. Therefore, our halfway between answer of 171.5 above is correct.
Halfway Between
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Halfway Between 55 and 289
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