Halfway Between 21 and 307

When you ask "What number is halfway between 21 and 307?" 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=307.

Halfway Between Line

To find the number halfway between 21 and 307, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 21 and 307 into our formula, we get:

(21 + 307)/2 = 164

Thus, the number halfway between 21 and 307 is 164.

To check that our answer is correct, we subtract 21 from 164 and subtract 164 from 307 and compare the two numbers:

164 - 21 = 143
307 - 164 = 143

As you can see, the halfway number is 143 higher than 21 and 143 lower than 307. Therefore, our halfway between answer of 164 above is correct.

Halfway Between
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Halfway Between 21 and 308
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