In previous lessons, students multiplied three-digit numbers and two-digit numbers, using strategies based on place value and the properties of operations. Students used diagrams to illustrate and explain their partial products calculations.
In this lesson, students move from diagrams to an algorithm that records partial products which they used in an earlier course when multiplying a two-digit number and a two-digit number. Students relate partial product expressions to diagrams and then analyze a systematic way to record partial products. This work sets students up to learn the standard algorithm in the next lesson.
- Action and Expression
- Multiply a three-digit number and a two-digit number.
- Represent a partial products algorithm.
- Let’s find partial products.
Materials to Copy
- Partial Product Expressions
- Create a set of cards from the blackline master for each group of 2.
|Activity 1||20 min|
|Activity 2||15 min|
|Lesson Synthesis||10 min|
Teacher Reflection Questions
- Number Puzzles: Multiplication and Division (4–5), Stage 1: Two-digit Factors (Supporting)
Print Formatted Materials
For access, consult one of our IM Certified Partners.