When you ask "What number is halfway between 20 and 190?" 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=190.
To find the number halfway between 20 and 190, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 190 into our formula, we get:
(20 + 190)/2 = 105
Thus, the number halfway between 20 and 190 is 105.
To check that our answer is correct, we subtract 20 from 105 and subtract 105 from 190 and compare the two numbers:
105 - 20 = 85
190 - 105 = 85
As you can see, the halfway number is 85 higher than 20 and 85 lower than 190. Therefore, our halfway between answer of 105 above is correct.
Halfway Between
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Halfway Between 20 and 191
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