When you ask "What number is halfway between 84 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=84 and Y=351.
To find the number halfway between 84 and 351, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 351 into our formula, we get:
(84 + 351)/2 = 217.5
Thus, the number halfway between 84 and 351 is 217.5.
To check that our answer is correct, we subtract 84 from 217.5 and subtract 217.5 from 351 and compare the two numbers:
217.5 - 84 = 133.5
351 - 217.5 = 133.5
As you can see, the halfway number is 133.5 higher than 84 and 133.5 lower than 351. Therefore, our halfway between answer of 217.5 above is correct.
Halfway Between
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Halfway Between 84 and 352
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