When you ask "What number is halfway between 20 and 159?" 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=159.
To find the number halfway between 20 and 159, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 159 into our formula, we get:
(20 + 159)/2 = 89.5
Thus, the number halfway between 20 and 159 is 89.5.
To check that our answer is correct, we subtract 20 from 89.5 and subtract 89.5 from 159 and compare the two numbers:
89.5 - 20 = 69.5
159 - 89.5 = 69.5
As you can see, the halfway number is 69.5 higher than 20 and 69.5 lower than 159. Therefore, our halfway between answer of 89.5 above is correct.
Halfway Between
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Halfway Between 20 and 160
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