What is 5.421 corrected to one decimal place?

Answer 1

You can 'round' that number to one decimal place, but you don't 'correct' it by doing that.

Numbers are frequently rounded, but you shouldn't make the mistake of thinking that the

process of rounding doesn't change the value of the number. In fact, the rounded form of

the number is a different number, and in that sense, it's incorrect. But we use it anyway,

because it's easier to use and it's 'close enough'.

When rounded to a single decimal place, 5.421 becomes 5.4 . But 5.4 is incorrect by 0.387 percent.