When you ask "What number is halfway between 20 and 225?" 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=225.
To find the number halfway between 20 and 225, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 225 into our formula, we get:
(20 + 225)/2 = 122.5
Thus, the number halfway between 20 and 225 is 122.5.
To check that our answer is correct, we subtract 20 from 122.5 and subtract 122.5 from 225 and compare the two numbers:
122.5 - 20 = 102.5
225 - 122.5 = 102.5
As you can see, the halfway number is 102.5 higher than 20 and 102.5 lower than 225. Therefore, our halfway between answer of 122.5 above is correct.
Halfway Between
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Halfway Between 20 and 226
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