When you ask "What number is halfway between 71 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=71 and Y=218.
To find the number halfway between 71 and 218, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 71 and 218 into our formula, we get:
(71 + 218)/2 = 144.5
Thus, the number halfway between 71 and 218 is 144.5.
To check that our answer is correct, we subtract 71 from 144.5 and subtract 144.5 from 218 and compare the two numbers:
144.5 - 71 = 73.5
218 - 144.5 = 73.5
As you can see, the halfway number is 73.5 higher than 71 and 73.5 lower than 218. Therefore, our halfway between answer of 144.5 above is correct.
Halfway Between
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Halfway Between 71 and 219
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