
When you ask "What number is halfway between 71 and 291?" 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=291.

To find the number halfway between 71 and 291, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 71 and 291 into our formula, we get:
(71 + 291)/2 = 181
Thus, the number halfway between 71 and 291 is 181.
To check that our answer is correct, we subtract 71 from 181 and subtract 181 from 291 and compare the two numbers:
181 - 71 = 110
291 - 181 = 110
As you can see, the halfway number is 110 higher than 71 and 110 lower than 291. Therefore, our halfway between answer of 181 above is correct.
Halfway Between
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Halfway Between 71 and 292
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