When you ask "What number is halfway between 42 and 55?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=42 and Y=55.
To find the number halfway between 42 and 55, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 55 into our formula, we get:
(42 + 55)/2 = 48.5
Thus, the number halfway between 42 and 55 is 48.5.
To check that our answer is correct, we subtract 42 from 48.5 and subtract 48.5 from 55 and compare the two numbers:
48.5 - 42 = 6.5
55 - 48.5 = 6.5
As you can see, the halfway number is 6.5 higher than 42 and 6.5 lower than 55. Therefore, our halfway between answer of 48.5 above is correct.
Halfway Between
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Halfway Between 42 and 56
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