Lesson 5
Standard Algorithm: Multidigit Numbers without Composing
Lesson Purpose
Lesson Narrative
In a previous lesson, students used the standard algorithm to multiply up to fivedigit numbers by onedigit numbers. They connected the standard algorithm to a different algorithm that uses partial products. In this lesson, students find products of a threedigit number and a twodigit number when composing is not required. The numbers in this lesson do not require composing so that students can make sense of where to record the second partial when using the standard algorithm to multiply a threedigit number by a twodigit number. Students will work with products of a twodigit number and a threedigit number when composing is required in the next lesson.
 Representation
 MLR8
Learning Goals
Teacher Facing
 Use the standard algorithm to multiply up to threedigit numbers and twodigit numbers, without composing new units.
Student Facing
 Let’s use the standard algorithm to multiply twodigit numbers and threedigit numbers.
Required Preparation
Lesson Timeline
Warmup  10 min 
Activity 1  20 min 
Activity 2  15 min 
Lesson Synthesis  10 min 
Cooldown  5 min 
Teacher Reflection Questions
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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