When you ask "What number is halfway between 55 and 109?" 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=109.
To find the number halfway between 55 and 109, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 109 into our formula, we get:
(55 + 109)/2 = 82
Thus, the number halfway between 55 and 109 is 82.
To check that our answer is correct, we subtract 55 from 82 and subtract 82 from 109 and compare the two numbers:
82 - 55 = 27
109 - 82 = 27
As you can see, the halfway number is 27 higher than 55 and 27 lower than 109. Therefore, our halfway between answer of 82 above is correct.
Halfway Between
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Halfway Between 55 and 110
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