# Summary:

After playing an interactive game online, students explore the concept of multiplying with a 2-digit number. Initially the teacher models with MAB and on the board using a grid and then the students go off and continue working.

# Australian Curriculum Links:

Year 3

- Recall multiplication facts of two, three, five and ten and related division facts (ACMNA056)
- Represent and solve problems involving multiplication using efficient mental and written strategies and appropriate digital technologies (ACMNA057)

# Lesson:

**Orientation**** **5** **minutes

**Focus:**Students attention to game on board.**Engage:**Play multiplication game to check students’ level of understanding http://www.math-play.com/one-digit-by-two-digit-multiplication-game.html**Access:**Who knows how to multiply by 2-digit numbers?

**Guided Discovery**

- Demonstrate multiplication by 2-digit numbers on whiteboard. Explain how this is similar to the trading we use in addition.
- Play game to further enhance student understanding about multiplication by 2-digit numbers. http://www.math-play.com/one-digit-by-two-digit-multiplication-game.html

**Exploration**

- Students demonstrate their understanding of multiplication by 2-digit numbers by attempting to complete a worksheet.

**Individualising**

- Extend: Students assist their peers who require support.
- Support: Teacher assists those who are having difficulty.

**Reflection** 5** **minutes

**Share/Explain/Justify:**Share answers so whole class can check their answers.**Reflect:**Let those who got questions wrong discuss where they made a mistake.**Consolidate:**Explain to student that it is tricky not to get trading in addition, subtraction and multiplication mixed up. How can we overcome this complication?**Challenge/Extend:**Who thinks they can multiply by a 3-digit number?

# Assessment:

- Observation and product analysis

# Resources:

- 2 Digit Multiplication Worksheets
- MAB to model
- Whiteboard and markers
- http://www.math-play.com/one-digit-by-two-digit-multiplication-game.html (External Link)

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