When you ask "What number is halfway between 87 and 330?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=87 and Y=330.
To find the number halfway between 87 and 330, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 330 into our formula, we get:
(87 + 330)/2 = 208.5
Thus, the number halfway between 87 and 330 is 208.5.
To check that our answer is correct, we subtract 87 from 208.5 and subtract 208.5 from 330 and compare the two numbers:
208.5 - 87 = 121.5
330 - 208.5 = 121.5
As you can see, the halfway number is 121.5 higher than 87 and 121.5 lower than 330. Therefore, our halfway between answer of 208.5 above is correct.
Halfway Between
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Halfway Between 87 and 331
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