When you ask "What number is halfway between 21 and 286?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=21 and Y=286.
To find the number halfway between 21 and 286, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 286 into our formula, we get:
(21 + 286)/2 = 153.5
Thus, the number halfway between 21 and 286 is 153.5.
To check that our answer is correct, we subtract 21 from 153.5 and subtract 153.5 from 286 and compare the two numbers:
153.5 - 21 = 132.5
286 - 153.5 = 132.5
As you can see, the halfway number is 132.5 higher than 21 and 132.5 lower than 286. Therefore, our halfway between answer of 153.5 above is correct.
Halfway Between
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Halfway Between 21 and 287
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