When you ask "What number is halfway between 18 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=18 and Y=425.
To find the number halfway between 18 and 425, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 425 into our formula, we get:
(18 + 425)/2 = 221.5
Thus, the number halfway between 18 and 425 is 221.5.
To check that our answer is correct, we subtract 18 from 221.5 and subtract 221.5 from 425 and compare the two numbers:
221.5 - 18 = 203.5
425 - 221.5 = 203.5
As you can see, the halfway number is 203.5 higher than 18 and 203.5 lower than 425. Therefore, our halfway between answer of 221.5 above is correct.
Halfway Between
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Halfway Between 18 and 426
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