When you ask "What number is halfway between 7 and 20?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=7 and Y=20.
To find the number halfway between 7 and 20, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 20 into our formula, we get:
(7 + 20)/2 = 13.5
Thus, the number halfway between 7 and 20 is 13.5.
To check that our answer is correct, we subtract 7 from 13.5 and subtract 13.5 from 20 and compare the two numbers:
13.5 - 7 = 6.5
20 - 13.5 = 6.5
As you can see, the halfway number is 6.5 higher than 7 and 6.5 lower than 20. Therefore, our halfway between answer of 13.5 above is correct.
Halfway Between
Find halfway between two other numbers here!
Halfway Between 7 and 21
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