When you ask "What number is halfway between 54 and 103?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=54 and Y=103.
To find the number halfway between 54 and 103, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 54 and 103 into our formula, we get:
(54 + 103)/2 = 78.5
Thus, the number halfway between 54 and 103 is 78.5.
To check that our answer is correct, we subtract 54 from 78.5 and subtract 78.5 from 103 and compare the two numbers:
78.5 - 54 = 24.5
103 - 78.5 = 24.5
As you can see, the halfway number is 24.5 higher than 54 and 24.5 lower than 103. Therefore, our halfway between answer of 78.5 above is correct.
Halfway Between
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Halfway Between 54 and 104
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