When you ask "What number is halfway between 66 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=66 and Y=189.
To find the number halfway between 66 and 189, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 66 and 189 into our formula, we get:
(66 + 189)/2 = 127.5
Thus, the number halfway between 66 and 189 is 127.5.
To check that our answer is correct, we subtract 66 from 127.5 and subtract 127.5 from 189 and compare the two numbers:
127.5 - 66 = 61.5
189 - 127.5 = 61.5
As you can see, the halfway number is 61.5 higher than 66 and 61.5 lower than 189. Therefore, our halfway between answer of 127.5 above is correct.
Halfway Between
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Halfway Between 66 and 190
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