When you ask "What number is halfway between 66 and 113?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=66 and Y=113.
To find the number halfway between 66 and 113, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 66 and 113 into our formula, we get:
(66 + 113)/2 = 89.5
Thus, the number halfway between 66 and 113 is 89.5.
To check that our answer is correct, we subtract 66 from 89.5 and subtract 89.5 from 113 and compare the two numbers:
89.5 - 66 = 23.5
113 - 89.5 = 23.5
As you can see, the halfway number is 23.5 higher than 66 and 23.5 lower than 113. Therefore, our halfway between answer of 89.5 above is correct.
Halfway Between
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Halfway Between 66 and 114
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