When you ask "What number is halfway between 21 and 182?" 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=182.
To find the number halfway between 21 and 182, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 182 into our formula, we get:
(21 + 182)/2 = 101.5
Thus, the number halfway between 21 and 182 is 101.5.
To check that our answer is correct, we subtract 21 from 101.5 and subtract 101.5 from 182 and compare the two numbers:
101.5 - 21 = 80.5
182 - 101.5 = 80.5
As you can see, the halfway number is 80.5 higher than 21 and 80.5 lower than 182. Therefore, our halfway between answer of 101.5 above is correct.
Halfway Between
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Halfway Between 21 and 183
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