When you ask "What number is halfway between 20 and 145?" 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=145.
To find the number halfway between 20 and 145, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 145 into our formula, we get:
(20 + 145)/2 = 82.5
Thus, the number halfway between 20 and 145 is 82.5.
To check that our answer is correct, we subtract 20 from 82.5 and subtract 82.5 from 145 and compare the two numbers:
82.5 - 20 = 62.5
145 - 82.5 = 62.5
As you can see, the halfway number is 62.5 higher than 20 and 62.5 lower than 145. Therefore, our halfway between answer of 82.5 above is correct.
Halfway Between
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Halfway Between 20 and 146
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