When you ask "What number is halfway between 66 and 149?" 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=149.
To find the number halfway between 66 and 149, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 66 and 149 into our formula, we get:
(66 + 149)/2 = 107.5
Thus, the number halfway between 66 and 149 is 107.5.
To check that our answer is correct, we subtract 66 from 107.5 and subtract 107.5 from 149 and compare the two numbers:
107.5 - 66 = 41.5
149 - 107.5 = 41.5
As you can see, the halfway number is 41.5 higher than 66 and 41.5 lower than 149. Therefore, our halfway between answer of 107.5 above is correct.
Halfway Between
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Halfway Between 66 and 150
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