Teaching Renaming/Trading – A multiplication lesson on us…

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?