When you ask "What number is halfway between 81 and 123?" 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=123.
To find the number halfway between 81 and 123, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 123 into our formula, we get:
(81 + 123)/2 = 102
Thus, the number halfway between 81 and 123 is 102.
To check that our answer is correct, we subtract 81 from 102 and subtract 102 from 123 and compare the two numbers:
102 - 81 = 21
123 - 102 = 21
As you can see, the halfway number is 21 higher than 81 and 21 lower than 123. Therefore, our halfway between answer of 102 above is correct.
Halfway Between
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Halfway Between 81 and 124
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