When you ask "What number is halfway between 84 and 355?" 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=355.
To find the number halfway between 84 and 355, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 355 into our formula, we get:
(84 + 355)/2 = 219.5
Thus, the number halfway between 84 and 355 is 219.5.
To check that our answer is correct, we subtract 84 from 219.5 and subtract 219.5 from 355 and compare the two numbers:
219.5 - 84 = 135.5
355 - 219.5 = 135.5
As you can see, the halfway number is 135.5 higher than 84 and 135.5 lower than 355. Therefore, our halfway between answer of 219.5 above is correct.
Halfway Between
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Halfway Between 84 and 356
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