When you ask "What number is halfway between 21 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=21 and Y=285.
To find the number halfway between 21 and 285, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 285 into our formula, we get:
(21 + 285)/2 = 153
Thus, the number halfway between 21 and 285 is 153.
To check that our answer is correct, we subtract 21 from 153 and subtract 153 from 285 and compare the two numbers:
153 - 21 = 132
285 - 153 = 132
As you can see, the halfway number is 132 higher than 21 and 132 lower than 285. Therefore, our halfway between answer of 153 above is correct.
Halfway Between
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Halfway Between 21 and 286
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