Add and subtract money amounts: word problems

Learning Objectives Identify keywords in word problems that indicate addition or subtraction of money. Translate real-world money scenarios into mathematical expressions involving addition and subtraction. Accurately add money amounts, ensuring correct decimal placement. Accurately subtract money amounts, ensuring correct decimal placement. Solve multi-step word problems involving both addition and subtraction of money. Calculate change received after a purchase. Interpret and verify the reasonableness of solutions to money word problems. Ever wondered how much money you'd save if you packed your lunch instead of buying it? 🥪💸 Let's find out how math helps us manage our money! In this lesson, you'll learn how to tackle word problems involving adding and s...

TermDefinitionExample Money AmountThe value of currency, typically expressed in dollars and cents (e.g., $15.75).A shirt costs $24.99. Here, $24.99 is a money amount. Word ProblemA mathematical problem presented in a narrative or story format, requiring careful reading and interpretation to solve.If John has $10 and spends $3.50, how much does he have left? This is a word problem. TotalThe result of adding two or more numbers together; often indicated by keywords like 'in all,' 'altogether,' or 'sum.'The total cost of a book and a pen is $15.75 + $2.25 = $18.00. DifferenceThe result of subtracting one number from another; often indicated by keywords like 'how much more,' 'how much less,' or 'change.'The difference between $20.00...

Aligning Decimals for Addition/Subtraction When adding or subtracting money amounts, always align the decimal points vertically. This rule ensures that dollars are added/subtracted with dollars and cents with cents, preventing errors in place value. You can add zeros to the right of the decimal point to make the number of decimal places consistent, e.g., $5.00 instead of $5. Identifying Operations from Keywords Carefully read the word problem to identify keywords. Keywords like 'total,' 'sum,' 'in all,' 'altogether,' 'combined' usually mean addition. Keywords like 'difference,' 'how much more/less,' 'change,' 'left,' 'spent' usually mean subtraction. Understanding these keywor...