When you ask "What number is halfway between 71 and 151?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=71 and Y=151.
To find the number halfway between 71 and 151, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 71 and 151 into our formula, we get:
(71 + 151)/2 = 111
Thus, the number halfway between 71 and 151 is 111.
To check that our answer is correct, we subtract 71 from 111 and subtract 111 from 151 and compare the two numbers:
111 - 71 = 40
151 - 111 = 40
As you can see, the halfway number is 40 higher than 71 and 40 lower than 151. Therefore, our halfway between answer of 111 above is correct.
Halfway Between
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Halfway Between 71 and 152
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