Lesson 4
Standard Algorithm: Onedigit and Multidigit Numbers with Composing
Lesson Purpose
The purpose of this lesson is for students to use the standard algorithm to multiply up to fivedigit numbers and onedigit numbers.
Lesson Narrative
In grade 4, students interpreted the standard algorithm for multiplication and compared it to a partial products algorithm to multiply up to fourdigit numbers and onedigit numbers. In this lesson, students extend their understanding of the standard algorithm to multiply up to fivedigit numbers and onedigit numbers, including problems where one or more new units are composed. This is the first in a series of lessons to support students in developing fluency using the standard algorithm to multiply multidigit numbers.
 Representation
Learning Goals
Teacher Facing
 Use the standard algorithm to multiply up to fivedigit numbers by onedigit factors, including composing new units.
Student Facing
 Let’s use the standard algorithm to multiply onedigit numbers and multidigit numbers.
Required Preparation
CCSS Standards
Addressing
Lesson Timeline
Warmup  10 min 
Activity 1  20 min 
Activity 2  15 min 
Lesson Synthesis  10 min 
Cooldown  5 min 
Teacher Reflection Questions
What evidence do you see that your students are applying what they learned about partial products to make sense of the standard algorithm?
Suggested Centers
 Number Puzzles: Multiplication and Division (4–5), Stage 2: Multidigit Factors (Addressing)
Print Formatted Materials
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Additional Resources
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