© 2007-2009 Pitsco EducationMO•0807•0709•011HomeworkChemical MathSession 5When you solve story problems and problems you will encounter outside of school, it is oftennecessary to translate words into a mathematical expression or equation. Recall equationsinvolve an equality symbol while expressions do not. Look for keywords to help write theappropriate operations. A few keywords for each operation are listed below.Addition: sum, total, all together, add, plus, moreSubtraction: difference, minus, less, subtractMultiplication: product, times, twice, double, multiplyDivision: quotient, divide, half, share, splitVariables can be referred to as “a number” or simply by the variable name, such as x. If a specificvariable is not mentioned, you can use any letter you wish to complete the expression.A number times five equals 20.b • 5 = 2018 less a number y.18 – yThe quotient of a number c and 12 is greater than 18.c ÷ 12 > 18The sum of 15 and the product of two and a number x.15 + 2 • x