When you ask "What number is halfway between 20 and 243?" 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=243.
To find the number halfway between 20 and 243, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 243 into our formula, we get:
(20 + 243)/2 = 131.5
Thus, the number halfway between 20 and 243 is 131.5.
To check that our answer is correct, we subtract 20 from 131.5 and subtract 131.5 from 243 and compare the two numbers:
131.5 - 20 = 111.5
243 - 131.5 = 111.5
As you can see, the halfway number is 111.5 higher than 20 and 111.5 lower than 243. Therefore, our halfway between answer of 131.5 above is correct.
Halfway Between
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Halfway Between 20 and 244
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