When you ask "What number is halfway between 66 and 157?" 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=157.
To find the number halfway between 66 and 157, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 66 and 157 into our formula, we get:
(66 + 157)/2 = 111.5
Thus, the number halfway between 66 and 157 is 111.5.
To check that our answer is correct, we subtract 66 from 111.5 and subtract 111.5 from 157 and compare the two numbers:
111.5 - 66 = 45.5
157 - 111.5 = 45.5
As you can see, the halfway number is 45.5 higher than 66 and 45.5 lower than 157. Therefore, our halfway between answer of 111.5 above is correct.
Halfway Between
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Halfway Between 66 and 158
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