When you ask "What number is halfway between 90 and 165?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=90 and Y=165.
To find the number halfway between 90 and 165, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 90 and 165 into our formula, we get:
(90 + 165)/2 = 127.5
Thus, the number halfway between 90 and 165 is 127.5.
To check that our answer is correct, we subtract 90 from 127.5 and subtract 127.5 from 165 and compare the two numbers:
127.5 - 90 = 37.5
165 - 127.5 = 37.5
As you can see, the halfway number is 37.5 higher than 90 and 37.5 lower than 165. Therefore, our halfway between answer of 127.5 above is correct.
Halfway Between
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Halfway Between 90 and 166
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