When you ask "What number is halfway between 20 and 691?" 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=691.
To find the number halfway between 20 and 691, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 691 into our formula, we get:
(20 + 691)/2 = 355.5
Thus, the number halfway between 20 and 691 is 355.5.
To check that our answer is correct, we subtract 20 from 355.5 and subtract 355.5 from 691 and compare the two numbers:
355.5 - 20 = 335.5
691 - 355.5 = 335.5
As you can see, the halfway number is 335.5 higher than 20 and 335.5 lower than 691. Therefore, our halfway between answer of 355.5 above is correct.
Halfway Between
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Halfway Between 20 and 692
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