When you ask "What number is halfway between 21 and 189?" 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=189.
To find the number halfway between 21 and 189, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 189 into our formula, we get:
(21 + 189)/2 = 105
Thus, the number halfway between 21 and 189 is 105.
To check that our answer is correct, we subtract 21 from 105 and subtract 105 from 189 and compare the two numbers:
105 - 21 = 84
189 - 105 = 84
As you can see, the halfway number is 84 higher than 21 and 84 lower than 189. Therefore, our halfway between answer of 105 above is correct.
Halfway Between
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Halfway Between 21 and 190
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