When you ask "What number is halfway between 84 and 218?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=84 and Y=218.
To find the number halfway between 84 and 218, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 218 into our formula, we get:
(84 + 218)/2 = 151
Thus, the number halfway between 84 and 218 is 151.
To check that our answer is correct, we subtract 84 from 151 and subtract 151 from 218 and compare the two numbers:
151 - 84 = 67
218 - 151 = 67
As you can see, the halfway number is 67 higher than 84 and 67 lower than 218. Therefore, our halfway between answer of 151 above is correct.
Halfway Between
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Halfway Between 84 and 219
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