When you ask "What number is halfway between 21 and 284?" 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=284.
To find the number halfway between 21 and 284, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 284 into our formula, we get:
(21 + 284)/2 = 152.5
Thus, the number halfway between 21 and 284 is 152.5.
To check that our answer is correct, we subtract 21 from 152.5 and subtract 152.5 from 284 and compare the two numbers:
152.5 - 21 = 131.5
284 - 152.5 = 131.5
As you can see, the halfway number is 131.5 higher than 21 and 131.5 lower than 284. Therefore, our halfway between answer of 152.5 above is correct.
Halfway Between
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Halfway Between 21 and 285
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