When you ask "What number is halfway between 81 and 231?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=81 and Y=231.
To find the number halfway between 81 and 231, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 231 into our formula, we get:
(81 + 231)/2 = 156
Thus, the number halfway between 81 and 231 is 156.
To check that our answer is correct, we subtract 81 from 156 and subtract 156 from 231 and compare the two numbers:
156 - 81 = 75
231 - 156 = 75
As you can see, the halfway number is 75 higher than 81 and 75 lower than 231. Therefore, our halfway between answer of 156 above is correct.
Halfway Between
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Halfway Between 81 and 232
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