When you ask "What number is halfway between 81 and 351?" 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=351.
To find the number halfway between 81 and 351, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 351 into our formula, we get:
(81 + 351)/2 = 216
Thus, the number halfway between 81 and 351 is 216.
To check that our answer is correct, we subtract 81 from 216 and subtract 216 from 351 and compare the two numbers:
216 - 81 = 135
351 - 216 = 135
As you can see, the halfway number is 135 higher than 81 and 135 lower than 351. Therefore, our halfway between answer of 216 above is correct.
Halfway Between
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Halfway Between 81 and 352
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