When you ask "What number is halfway between 21 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=21 and Y=165.
To find the number halfway between 21 and 165, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 165 into our formula, we get:
(21 + 165)/2 = 93
Thus, the number halfway between 21 and 165 is 93.
To check that our answer is correct, we subtract 21 from 93 and subtract 93 from 165 and compare the two numbers:
93 - 21 = 72
165 - 93 = 72
As you can see, the halfway number is 72 higher than 21 and 72 lower than 165. Therefore, our halfway between answer of 93 above is correct.
Halfway Between
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Halfway Between 21 and 166
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