
When you ask "What number is halfway between 51 and 166?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=51 and Y=166.

To find the number halfway between 51 and 166, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 166 into our formula, we get:
(51 + 166)/2 = 108.5
Thus, the number halfway between 51 and 166 is 108.5.
To check that our answer is correct, we subtract 51 from 108.5 and subtract 108.5 from 166 and compare the two numbers:
108.5 - 51 = 57.5
166 - 108.5 = 57.5
As you can see, the halfway number is 57.5 higher than 51 and 57.5 lower than 166. Therefore, our halfway between answer of 108.5 above is correct.
Halfway Between
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Halfway Between 51 and 167
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