When you ask "What number is halfway between 20 and 219?" 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=219.
To find the number halfway between 20 and 219, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 219 into our formula, we get:
(20 + 219)/2 = 119.5
Thus, the number halfway between 20 and 219 is 119.5.
To check that our answer is correct, we subtract 20 from 119.5 and subtract 119.5 from 219 and compare the two numbers:
119.5 - 20 = 99.5
219 - 119.5 = 99.5
As you can see, the halfway number is 99.5 higher than 20 and 99.5 lower than 219. Therefore, our halfway between answer of 119.5 above is correct.
Halfway Between
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Halfway Between 20 and 220
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