Barbie's Dream House Budget Bonanza: A Multiplication Adventure

Materials Needed

• 1-3 Barbie dolls (or any favorite dolls)
• A shoebox or small cardboard box to serve as the "room"
• Pencil and eraser
• Calculator (optional, for checking work)
• Worksheet 1: "Dream Décor Store Catalog" (A pre-made sheet with pictures of doll-sized furniture and accessories like beds, chairs, lamps, rugs, etc., each with a price. Prices should include dollars and cents, like $12.50 or $8.75).
• Worksheet 2: "My Room Budget Plan" (A simple grid with columns for: Item, Price, Quantity, Total Cost). At the bottom, it should have a space for "Subtotal" and "Budget Remaining."
• Optional Craft Supplies: fabric scraps, colored paper, glue, scissors, small beads for making custom decorations.

Lesson Plan Details

Subject: Math (Multiplication with Decimals, Budgeting)

Grade Level: 6th Grade (Approximately 12 years old)

Time Allotment: 60-75 minutes

1. Learning Objectives

By the end of this lesson, the student will be able to:

• Apply multiplication of multi-digit decimals to calculate costs in a real-world scenario.
• Create and manage a simple budget to meet a specific goal.
• Analyze choices and make decisions to stay within a financial limit.
• Design a creative space that reflects their planning and calculations.

2. Instructional Procedure

Part 1: The Design Brief (5-10 minutes)

Teacher: "Great news! Barbie has saved up some money and wants to hire you as her official interior designer to redecorate a room in her Dream House! She has given you a firm budget of $120.00. Your job is to design the most amazing room possible without going a single penny over budget. Are you up for the challenge?"

Present the student with the shoebox "room," the Barbie doll client, the "Dream Décor Store Catalog," and the "My Room Budget Plan" worksheet.

Part 2: How Designers Do Math (10 minutes)

Teacher: "Before you start shopping, let's review how we calculate costs. Let's say Barbie wants two of these fabulous throw pillows, and the catalog says they cost $3.25 each. How do we find the total?"

• Work together to set up the multiplication problem: 3.25 x 2.
• Model how to multiply the numbers as if they were whole numbers (325 x 2 = 650).
• Remind the student of the rule for placing the decimal: "Count the total number of decimal places in the numbers you multiplied (in 3.25, there are two), and place the decimal that many spots from the right in your answer." The answer is $6.50.
• Do one more guided example together, perhaps with a quantity of 3 or 4.

Part 3: The Shopping Spree (25-30 minutes)

This is the core, independent part of the lesson. The student takes the lead.

Teacher: "Alright, designer, the store is yours! Look through the catalog and decide what you want to put in Barbie's room. For each item you choose, you must fill out a line on your 'My Room Budget Plan' worksheet. Remember to multiply the price by the quantity to get the total cost for that item."

• The student browses the catalog, makes choices, and fills out their budget sheet.
• Encourage them to keep a running total of their spending so they know how much budget they have left.
• Your role is to be a supportive guide. Ask questions like:
  • "I see you want three chairs. Can you show me how you calculated the total cost?"
  • "How much money do you have left to spend?"
  • "Oh, that lamp is beautiful! Do you have enough in your budget for it?"

Part 4: The Big Reveal (10-15 minutes)

Teacher: "It's time for the big reveal! Barbie is so excited to see her new room. Can you present your design to us?"

• The student gives a "tour" of their room design (either by pointing to the items on their list or by placing drawings/crafts in the shoebox).
• They share their completed "My Room Budget Plan" worksheet, explaining their calculations for a few key items.
• Ask follow-up questions: "What was the most expensive item you bought? What was the hardest decision you had to make to stay on budget? Are you proud of the final result?"

3. Differentiation and Extension

• For Extra Support: Use a catalog with whole-dollar amounts to remove the complexity of decimals. Provide a calculator for the multiplication step so the focus remains on the budgeting and decision-making process.
• For an Advanced Challenge:
  • Add a Sales Tax: Introduce a 5% or 10% sales tax that must be calculated on the subtotal and added to the final cost. (e.g., Subtotal x 0.10 = Tax Amount).
  • "On Sale!" Items: Include items in the catalog that are "20% off," requiring the student to first calculate the discount before calculating the total cost.
  • DIY Challenge: Challenge the student to "craft" one item instead of buying it to save money, using the optional craft supplies.

4. Assessment

• Formative (During Lesson): Observe the student's process. Are they correctly setting up the multiplication problems? Are they keeping track of their budget? Listen to their reasoning and problem-solving as they make choices.
• Summative (End of Lesson): The completed "My Room Budget Plan" worksheet serves as the primary assessment. Check for:
  • Accuracy in multiplication with decimals.
  • Correctly calculated subtotals.
  • The final cost being at or under the $120.00 budget.