When you ask "What number is halfway between 20 and 213?" 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=213.
To find the number halfway between 20 and 213, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 213 into our formula, we get:
(20 + 213)/2 = 116.5
Thus, the number halfway between 20 and 213 is 116.5.
To check that our answer is correct, we subtract 20 from 116.5 and subtract 116.5 from 213 and compare the two numbers:
116.5 - 20 = 96.5
213 - 116.5 = 96.5
As you can see, the halfway number is 96.5 higher than 20 and 96.5 lower than 213. Therefore, our halfway between answer of 116.5 above is correct.
Halfway Between
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Halfway Between 20 and 214
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