When you ask "What number is halfway between 100 and 285?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=100 and Y=285.
To find the number halfway between 100 and 285, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 285 into our formula, we get:
(100 + 285)/2 = 192.5
Thus, the number halfway between 100 and 285 is 192.5.
To check that our answer is correct, we subtract 100 from 192.5 and subtract 192.5 from 285 and compare the two numbers:
192.5 - 100 = 92.5
285 - 192.5 = 92.5
As you can see, the halfway number is 92.5 higher than 100 and 92.5 lower than 285. Therefore, our halfway between answer of 192.5 above is correct.
Halfway Between
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Halfway Between 100 and 286
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