When you ask "What number is halfway between 81 and 230?" 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=230.
To find the number halfway between 81 and 230, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 230 into our formula, we get:
(81 + 230)/2 = 155.5
Thus, the number halfway between 81 and 230 is 155.5.
To check that our answer is correct, we subtract 81 from 155.5 and subtract 155.5 from 230 and compare the two numbers:
155.5 - 81 = 74.5
230 - 155.5 = 74.5
As you can see, the halfway number is 74.5 higher than 81 and 74.5 lower than 230. Therefore, our halfway between answer of 155.5 above is correct.
Halfway Between
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Halfway Between 81 and 231
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