When you ask "What number is halfway between 51 and 171?" 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=171.
To find the number halfway between 51 and 171, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 171 into our formula, we get:
(51 + 171)/2 = 111
Thus, the number halfway between 51 and 171 is 111.
To check that our answer is correct, we subtract 51 from 111 and subtract 111 from 171 and compare the two numbers:
111 - 51 = 60
171 - 111 = 60
As you can see, the halfway number is 60 higher than 51 and 60 lower than 171. Therefore, our halfway between answer of 111 above is correct.
Halfway Between
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Halfway Between 51 and 172
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