When you ask "What number is halfway between 89 and 166?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=89 and Y=166.
To find the number halfway between 89 and 166, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 89 and 166 into our formula, we get:
(89 + 166)/2 = 127.5
Thus, the number halfway between 89 and 166 is 127.5.
To check that our answer is correct, we subtract 89 from 127.5 and subtract 127.5 from 166 and compare the two numbers:
127.5 - 89 = 38.5
166 - 127.5 = 38.5
As you can see, the halfway number is 38.5 higher than 89 and 38.5 lower than 166. Therefore, our halfway between answer of 127.5 above is correct.
Halfway Between
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Halfway Between 89 and 167
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