When you ask "What number is halfway between 3 and 81?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=3 and Y=81.
To find the number halfway between 3 and 81, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 3 and 81 into our formula, we get:
(3 + 81)/2 = 42
Thus, the number halfway between 3 and 81 is 42.
To check that our answer is correct, we subtract 3 from 42 and subtract 42 from 81 and compare the two numbers:
42 - 3 = 39
81 - 42 = 39
As you can see, the halfway number is 39 higher than 3 and 39 lower than 81. Therefore, our halfway between answer of 42 above is correct.
Halfway Between
Find halfway between two other numbers here!
Halfway Between 3 and 82
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