When you ask "What number is halfway between 1 and 84?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=1 and Y=84.
To find the number halfway between 1 and 84, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 1 and 84 into our formula, we get:
(1 + 84)/2 = 42.5
Thus, the number halfway between 1 and 84 is 42.5.
To check that our answer is correct, we subtract 1 from 42.5 and subtract 42.5 from 84 and compare the two numbers:
42.5 - 1 = 41.5
84 - 42.5 = 41.5
As you can see, the halfway number is 41.5 higher than 1 and 41.5 lower than 84. Therefore, our halfway between answer of 42.5 above is correct.
Halfway Between
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Halfway Between 1 and 85
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