When you ask "What number is halfway between 81 and 145?" 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=145.
To find the number halfway between 81 and 145, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 145 into our formula, we get:
(81 + 145)/2 = 113
Thus, the number halfway between 81 and 145 is 113.
To check that our answer is correct, we subtract 81 from 113 and subtract 113 from 145 and compare the two numbers:
113 - 81 = 32
145 - 113 = 32
As you can see, the halfway number is 32 higher than 81 and 32 lower than 145. Therefore, our halfway between answer of 113 above is correct.
Halfway Between
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Halfway Between 81 and 146
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