Decimals | Project Based Learning
Students work in teams to plan and price a small class store or snack stand using decimals to the hundredths place. They compare prices, add totals, and make purchasing decisions based on a budget. The project builds decimal understanding through realistic problem solving and collaboration.
| Term | Definition |
|---|---|
| decimal | A number that shows parts of a whole using a decimal point. |
| tenths | The first digit to the right of the decimal point; one out of ten equal parts. |
| hundredths | The second digit to the right of the decimal point; one out of one hundred equal parts. |
| compare | To look at two numbers and decide which is greater, less, or equal. |
| estimate | To make a close, reasonable guess. |
| sum | The answer to an addition problem. |
Introduce the project: teams will create a mini store plan with 5 items and prices using decimals. Model how decimals show money amounts and explain that teams must stay within a set budget, such as $10.00.
Listen, ask questions, and preview the goal of creating a budget-friendly store plan.
Review place value to the hundredths place using a chart and a number line. Model comparing two prices and adding two decimal amounts by lining up decimal points.
Practice reading and comparing sample prices with the class.
Assign roles if helpful, such as recorder, checker, and presenter. Give each team item cards or allow them to design their own list of items and prices. Circulate to prompt careful decimal placement and budget checking.
Work together to choose items, assign prices, record totals, and make sure their plan stays within budget.
Ask teams to verify at least one total by estimating first, then adding precisely. Prompt students to check whether any item or total needs revision to fit the budget.
Review calculations, correct errors, and revise prices or item choices as needed.
Invite a few teams to present their store plan and explain how they used decimals to compare and total prices. Highlight accurate math language and clear reasoning.
Present their work, explain their math, and listen respectfully to classmates.
Review one or two team examples and restate the key idea that decimals help us represent money and solve real-world problems. End with a brief reflection: 'One thing I learned about decimals today is...'.