Big Multiplication: Three-Digit by Two-Digit Numbers

Learning Objectives

• Multiply a three-digit number by a two-digit number using the standard algorithm.
• Use area models and partial products to explain the algorithm.
• Estimate products to check that answers are reasonable.

How to Use This Resource

• Show the slides and model 243 × 36 with an area model, then with the standard algorithm.
• Use the flashcards for vocabulary and estimation practice, then complete the worksheet.
• Use the quiz to check learning and send the homework home; answers are in the answer keys.

Classroom Activity Ideas

• Estimate race: show a problem for five seconds; students write an estimate before solving.
• Error detective: give worked examples with one mistake each; pairs find and fix the error.
• Real-life multiplication: students find the cost of 24 class tickets at $125 each.

Differentiation

Support: use area models and multiplication charts. Challenge: multiply four-digit by two-digit numbers and create word problems for a partner.

Assessment

The worksheet and quiz check accuracy and estimation (answer keys included). Use the rubric for explanations and problem solving.

Teacher Tips

Remind students why the zero placeholder is there: when multiplying by the tens digit, they are really multiplying by a multiple of ten (30, not 3).

What's Included

• 10-page printable PDF lesson pack: teacher lesson plan with timings, materials and differentiation
• Key vocabulary list (7 words with meanings and examples)
• Student worksheet (5 activities)
• Quiz / assessment (3 parts)
• Homework practice page
• Printable flashcards: 7 A5 picture cards (separate PDF)
• Assessment rubric (4 levels)
• Lesson slides (editable PowerPoint)
• Editable Word version of all student pages
• Complete answer key (also as a separate PDF)

Additional Files

• Lesson Slides (PowerPoint, editable) (PPTX)
• Editable Student Pages + Lesson Plan (Word) (DOCX)
• Flashcards (PDF, A5, one card per page) (PDF)
• Answer Key (PDF) (PDF)

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