When you ask "What number is halfway between 20 and 425?" 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=425.
To find the number halfway between 20 and 425, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 425 into our formula, we get:
(20 + 425)/2 = 222.5
Thus, the number halfway between 20 and 425 is 222.5.
To check that our answer is correct, we subtract 20 from 222.5 and subtract 222.5 from 425 and compare the two numbers:
222.5 - 20 = 202.5
425 - 222.5 = 202.5
As you can see, the halfway number is 202.5 higher than 20 and 202.5 lower than 425. Therefore, our halfway between answer of 222.5 above is correct.
Halfway Between
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Halfway Between 20 and 426
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