When you ask "What number is halfway between 20 and 790?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=20 and Y=790.
To find the number halfway between 20 and 790, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 790 into our formula, we get:
(20 + 790)/2 = 405
Thus, the number halfway between 20 and 790 is 405.
To check that our answer is correct, we subtract 20 from 405 and subtract 405 from 790 and compare the two numbers:
405 - 20 = 385
790 - 405 = 385
As you can see, the halfway number is 385 higher than 20 and 385 lower than 790. Therefore, our halfway between answer of 405 above is correct.
Halfway Between
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Halfway Between 20 and 791
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