When working with equivalent fractions, there is one main rule to remember: whatever change you make to the top number (the numerator), you must also make to the bottom number (the denominator).
If you are simplifying a fraction, you divide both numbers by the same factor until you cannot divide any further. If you are changing a fraction into a power-of-ten denominator—like 10, 100, or 1,000—you multiply both the top and bottom by 10 each time you move up to the next place value. You keep going until you reach the largest denominator you need for your problem.
