Halfway Between 21 and 311

When you ask "What number is halfway between 21 and 311?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=21 and Y=311.

Halfway Between Line

To find the number halfway between 21 and 311, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 21 and 311 into our formula, we get:

(21 + 311)/2 = 166

Thus, the number halfway between 21 and 311 is 166.

To check that our answer is correct, we subtract 21 from 166 and subtract 166 from 311 and compare the two numbers:

166 - 21 = 145
311 - 166 = 145

As you can see, the halfway number is 145 higher than 21 and 145 lower than 311. Therefore, our halfway between answer of 166 above is correct.

Halfway Between
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Halfway Between 21 and 312
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