When you ask "What number is halfway between 20 and 780?" 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=780.
To find the number halfway between 20 and 780, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 780 into our formula, we get:
(20 + 780)/2 = 400
Thus, the number halfway between 20 and 780 is 400.
To check that our answer is correct, we subtract 20 from 400 and subtract 400 from 780 and compare the two numbers:
400 - 20 = 380
780 - 400 = 380
As you can see, the halfway number is 380 higher than 20 and 380 lower than 780. Therefore, our halfway between answer of 400 above is correct.
Halfway Between
Find halfway between two other numbers here!
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