reminder 320 60 Perimeter is the distance around an object. It is found by adding the lengths of all the sides. reminder 320 To add or subtract fractions, the denominators must be the same. What is the sum of the numerators? 9 What is the least common denominator between FRAC5/6 and FRAC1/4 ? 6 12 24 12 What number times 4 will equal 12? 3 reminder A common denominator is not needed to multiply or divide fractions.