Add and subtract money: word problems

Learning Objectives Identify key numerical information and operations within money-related word problems. Translate verbal descriptions of money transactions into mathematical expressions. Accurately add monetary amounts involving decimals. Accurately subtract monetary amounts involving decimals, including situations requiring borrowing. Solve multi-step word problems that combine addition and subtraction of money. Interpret their numerical solutions in the context of the original word problem. Check the reasonableness of their answers for money-related problems. Ever wonder how much change you should get back after buying snacks, or how much you've spent on a shopping trip? 💰 Mastering money math helps you manage your own finances! In this lesson, you'll learn...

TermDefinitionExample Word ProblemA mathematical problem presented in a narrative or descriptive form, requiring you to extract information and determine operations to find a solution.Sarah bought a book for $12.50 and a pen for $3.75. How much did she spend in total? Monetary AmountA quantity representing a value of money, typically expressed in dollars and cents, separated by a decimal point.$25.75 (twenty-five dollars and seventy-five cents). Keywords for AdditionWords or phrases in a word problem that indicate the need to combine amounts, such as 'total', 'sum', 'altogether', 'in all', 'combined', 'plus'.If you see 'total cost', it usually means you need to add. Keywords for SubtractionWords or phrases in a word pro...

Adding Monetary Amounts To add monetary amounts, align the decimal points vertically. Add the numbers column by column, starting from the rightmost digit. Place the decimal point in the sum directly below the aligned decimal points. $\$A.BC + \$D.EF = \$(A+D).(BC+EF)$ Use this rule when combining costs, finding a total amount spent, or calculating combined earnings. Ensure cents are added to cents and dollars to dollars. Subtracting Monetary Amounts To subtract monetary amounts, align the decimal points vertically. Subtract the numbers column by column, starting from the rightmost digit, borrowing from the left when necessary. Place the decimal point in the difference directly below the aligned decimal points. $\$A.BC - \$D.EF = \$(A-D).(BC-EF)$ Apply this rule when finding...