When you ask "What number is halfway between 81 and 169?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=81 and Y=169.
To find the number halfway between 81 and 169, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 169 into our formula, we get:
(81 + 169)/2 = 125
Thus, the number halfway between 81 and 169 is 125.
To check that our answer is correct, we subtract 81 from 125 and subtract 125 from 169 and compare the two numbers:
125 - 81 = 44
169 - 125 = 44
As you can see, the halfway number is 44 higher than 81 and 44 lower than 169. Therefore, our halfway between answer of 125 above is correct.
Halfway Between
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Halfway Between 81 and 170
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