When you ask "What number is halfway between 20 and 200?" 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=200.
To find the number halfway between 20 and 200, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 200 into our formula, we get:
(20 + 200)/2 = 110
Thus, the number halfway between 20 and 200 is 110.
To check that our answer is correct, we subtract 20 from 110 and subtract 110 from 200 and compare the two numbers:
110 - 20 = 90
200 - 110 = 90
As you can see, the halfway number is 90 higher than 20 and 90 lower than 200. Therefore, our halfway between answer of 110 above is correct.
Halfway Between
Find halfway between two other numbers here!
Halfway Between 20 and 201
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