When you ask "What number is halfway between 80 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=80 and Y=218.
To find the number halfway between 80 and 218, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 80 and 218 into our formula, we get:
(80 + 218)/2 = 149
Thus, the number halfway between 80 and 218 is 149.
To check that our answer is correct, we subtract 80 from 149 and subtract 149 from 218 and compare the two numbers:
149 - 80 = 69
218 - 149 = 69
As you can see, the halfway number is 69 higher than 80 and 69 lower than 218. Therefore, our halfway between answer of 149 above is correct.
Halfway Between
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Halfway Between 80 and 219
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