When you ask "What number is halfway between 20 and 287?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=20 and Y=287.
To find the number halfway between 20 and 287, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 287 into our formula, we get:
(20 + 287)/2 = 153.5
Thus, the number halfway between 20 and 287 is 153.5.
To check that our answer is correct, we subtract 20 from 153.5 and subtract 153.5 from 287 and compare the two numbers:
153.5 - 20 = 133.5
287 - 153.5 = 133.5
As you can see, the halfway number is 133.5 higher than 20 and 133.5 lower than 287. Therefore, our halfway between answer of 153.5 above is correct.
Halfway Between
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Halfway Between 20 and 288
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