When you ask "What number is halfway between 55 and 102?" 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=102.
To find the number halfway between 55 and 102, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 102 into our formula, we get:
(55 + 102)/2 = 78.5
Thus, the number halfway between 55 and 102 is 78.5.
To check that our answer is correct, we subtract 55 from 78.5 and subtract 78.5 from 102 and compare the two numbers:
78.5 - 55 = 23.5
102 - 78.5 = 23.5
As you can see, the halfway number is 23.5 higher than 55 and 23.5 lower than 102. Therefore, our halfway between answer of 78.5 above is correct.
Halfway Between
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Halfway Between 55 and 103
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