When you ask "What number is halfway between 43 and 216?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=43 and Y=216.
To find the number halfway between 43 and 216, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 43 and 216 into our formula, we get:
(43 + 216)/2 = 129.5
Thus, the number halfway between 43 and 216 is 129.5.
To check that our answer is correct, we subtract 43 from 129.5 and subtract 129.5 from 216 and compare the two numbers:
129.5 - 43 = 86.5
216 - 129.5 = 86.5
As you can see, the halfway number is 86.5 higher than 43 and 86.5 lower than 216. Therefore, our halfway between answer of 129.5 above is correct.
Halfway Between
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Halfway Between 43 and 217
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