When you ask "What number is halfway between 54 and 155?" 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=155.
To find the number halfway between 54 and 155, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 54 and 155 into our formula, we get:
(54 + 155)/2 = 104.5
Thus, the number halfway between 54 and 155 is 104.5.
To check that our answer is correct, we subtract 54 from 104.5 and subtract 104.5 from 155 and compare the two numbers:
104.5 - 54 = 50.5
155 - 104.5 = 50.5
As you can see, the halfway number is 50.5 higher than 54 and 50.5 lower than 155. Therefore, our halfway between answer of 104.5 above is correct.
Halfway Between
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Halfway Between 54 and 156
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