When you ask "What number is halfway between 20 and 199?" 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=199.
To find the number halfway between 20 and 199, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 199 into our formula, we get:
(20 + 199)/2 = 109.5
Thus, the number halfway between 20 and 199 is 109.5.
To check that our answer is correct, we subtract 20 from 109.5 and subtract 109.5 from 199 and compare the two numbers:
109.5 - 20 = 89.5
199 - 109.5 = 89.5
As you can see, the halfway number is 89.5 higher than 20 and 89.5 lower than 199. Therefore, our halfway between answer of 109.5 above is correct.
Halfway Between
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Halfway Between 20 and 200
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