Some operations can be written in a variety of forms. You should become familiar with the different forms. Following are several ways to show multiplication: Multiplication sign: 4 × 3 = 12 Multiplication dot: 4 · 3 = 12 Two sets of parentheses: (4)(3) = 12 One set of parentheses: 4(3) = 12 or (4)3 = 12 A number next to a variable (letter): 3 a means 3 times a. Two variables (letters) next to each other: ab means a times b. There are several ways to show division: Division sign: 10 ÷ 2 = 5 Fraction bar: = 5 or 10/2 = 5