2
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The answer depends on the extent of rounding. To the nearest ten it is 20; to the nearest hundred it is 0.
24
To round 12.4 to the nearest whole number, we look at the digit immediately to the right of the decimal point, which is 4. Since 4 is less than 5, we round down to the nearest whole number. Therefore, 12.4 rounded to the nearest whole number is 12.
If you are looking to round 23.6573 to the nearest whole number, that would be "24." Look at the tenths digit. If it is 5 or greater, you round the whole number up. If it is less than 5, the entire number would be "rounded down" to "23".
It is 2 because .4 is less than .5.