When you ask "What number is halfway between 66 and 197?" 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=197.
To find the number halfway between 66 and 197, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 66 and 197 into our formula, we get:
(66 + 197)/2 = 131.5
Thus, the number halfway between 66 and 197 is 131.5.
To check that our answer is correct, we subtract 66 from 131.5 and subtract 131.5 from 197 and compare the two numbers:
131.5 - 66 = 65.5
197 - 131.5 = 65.5
As you can see, the halfway number is 65.5 higher than 66 and 65.5 lower than 197. Therefore, our halfway between answer of 131.5 above is correct.
Halfway Between
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Halfway Between 66 and 198
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