When you ask "What number is halfway between 21 and 50?" 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=50.
To find the number halfway between 21 and 50, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 50 into our formula, we get:
(21 + 50)/2 = 35.5
Thus, the number halfway between 21 and 50 is 35.5.
To check that our answer is correct, we subtract 21 from 35.5 and subtract 35.5 from 50 and compare the two numbers:
35.5 - 21 = 14.5
50 - 35.5 = 14.5
As you can see, the halfway number is 14.5 higher than 21 and 14.5 lower than 50. Therefore, our halfway between answer of 35.5 above is correct.
Halfway Between
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Halfway Between 21 and 51
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