When you ask "What number is halfway between 72 and 311?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=72 and Y=311.
To find the number halfway between 72 and 311, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 72 and 311 into our formula, we get:
(72 + 311)/2 = 191.5
Thus, the number halfway between 72 and 311 is 191.5.
To check that our answer is correct, we subtract 72 from 191.5 and subtract 191.5 from 311 and compare the two numbers:
191.5 - 72 = 119.5
311 - 191.5 = 119.5
As you can see, the halfway number is 119.5 higher than 72 and 119.5 lower than 311. Therefore, our halfway between answer of 191.5 above is correct.
Halfway Between
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Halfway Between 72 and 312
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