When you ask "What number is halfway between 100 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=100 and Y=165.
To find the number halfway between 100 and 165, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 165 into our formula, we get:
(100 + 165)/2 = 132.5
Thus, the number halfway between 100 and 165 is 132.5.
To check that our answer is correct, we subtract 100 from 132.5 and subtract 132.5 from 165 and compare the two numbers:
132.5 - 100 = 32.5
165 - 132.5 = 32.5
As you can see, the halfway number is 32.5 higher than 100 and 32.5 lower than 165. Therefore, our halfway between answer of 132.5 above is correct.
Halfway Between
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Halfway Between 100 and 166
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