When you ask "What number is halfway between 87 and 902?" 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=902.
To find the number halfway between 87 and 902, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 902 into our formula, we get:
(87 + 902)/2 = 494.5
Thus, the number halfway between 87 and 902 is 494.5.
To check that our answer is correct, we subtract 87 from 494.5 and subtract 494.5 from 902 and compare the two numbers:
494.5 - 87 = 407.5
902 - 494.5 = 407.5
As you can see, the halfway number is 407.5 higher than 87 and 407.5 lower than 902. Therefore, our halfway between answer of 494.5 above is correct.
Halfway Between
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Halfway Between 87 and 903
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