
When you ask "What number is halfway between 72 and 690?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=72 and Y=690.

To find the number halfway between 72 and 690, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 72 and 690 into our formula, we get:
(72 + 690)/2 = 381
Thus, the number halfway between 72 and 690 is 381.
To check that our answer is correct, we subtract 72 from 381 and subtract 381 from 690 and compare the two numbers:
381 - 72 = 309
690 - 381 = 309
As you can see, the halfway number is 309 higher than 72 and 309 lower than 690. Therefore, our halfway between answer of 381 above is correct.
Halfway Between
Find halfway between two other numbers here!
Halfway Between 72 and 691
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