When you ask "What number is halfway between 18 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=18 and Y=84.
To find the number halfway between 18 and 84, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 84 into our formula, we get:
(18 + 84)/2 = 51
Thus, the number halfway between 18 and 84 is 51.
To check that our answer is correct, we subtract 18 from 51 and subtract 51 from 84 and compare the two numbers:
51 - 18 = 33
84 - 51 = 33
As you can see, the halfway number is 33 higher than 18 and 33 lower than 84. Therefore, our halfway between answer of 51 above is correct.
Halfway Between
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Halfway Between 18 and 85
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