When you ask "What number is halfway between 54 and 91?" 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=91.
To find the number halfway between 54 and 91, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 54 and 91 into our formula, we get:
(54 + 91)/2 = 72.5
Thus, the number halfway between 54 and 91 is 72.5.
To check that our answer is correct, we subtract 54 from 72.5 and subtract 72.5 from 91 and compare the two numbers:
72.5 - 54 = 18.5
91 - 72.5 = 18.5
As you can see, the halfway number is 18.5 higher than 54 and 18.5 lower than 91. Therefore, our halfway between answer of 72.5 above is correct.
Halfway Between
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Halfway Between 54 and 92
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