When you ask "What number is halfway between 20 and 423?" 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=423.
To find the number halfway between 20 and 423, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 423 into our formula, we get:
(20 + 423)/2 = 221.5
Thus, the number halfway between 20 and 423 is 221.5.
To check that our answer is correct, we subtract 20 from 221.5 and subtract 221.5 from 423 and compare the two numbers:
221.5 - 20 = 201.5
423 - 221.5 = 201.5
As you can see, the halfway number is 201.5 higher than 20 and 201.5 lower than 423. Therefore, our halfway between answer of 221.5 above is correct.
Halfway Between
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Halfway Between 20 and 424
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