Types of rounding

Typical rounding problems are

approximating an aberrant bulk by a fraction, e.g., π by 22/7;

approximating a atom with alternate decimal amplification by a bound decimal fraction, e.g., 5/3 by 1.6667;

replacing a rational bulk by a atom with abate numerator and denominator, e.g., 3122/9417 by 1/3;

replacing a apportioned decimal bulk by one with beneath digits, e.g., 2.1784 dollars by 2.18 dollars;

replacing a decimal accumulation by an accumulation with added abaft zeros, e.g., 23,217 humans by 23,200 people; or, in general,

replacing a bulk by a assorted of a defined amount, e.g., 27.2 abnormal by 30 abnormal (a assorted of 15).