1. Mental Math for Multiplication
Apply distributive decomposition, doubling/halving when valid, and compensation to multiply mentally.
Study this lesson →Chapter 4: Multiplication
6 lessons · 2 consolidation units · review and practice examination
A complete original chapter draft aligned to published topic sequence. Study each lesson, answer its checks, and use the chapter examination to locate gaps. Internally reviewed with controls; external educator/learner validation remains outstanding.
Lessons
2. Multiplying by a 1-Digit Number — Part 1
Explain multi-place one-digit multiplication using partial products before regrouping.
Study this lesson →3. Multiplying by a 1-Digit Number — Part 2
Coordinate successive regroupings and verify products by magnitude estimation.
Study this lesson →4. Multiplying by a Multiple of 10
Use base-ten scaling and area models for tens multipliers.
Study this lesson →5. Multiplying by a 2-Digit Number — Part 1
Expand both factors and combine four partial products in a diagram.
Study this lesson →6. Multiplying by a 2-Digit Number — Part 2
Connect area models to efficient written two-digit multiplication with carries.
Study this lesson →Consolidation and assessment
Practice 1
Original mixed practice with worked reasoning.
Open practice →Practice 2
Original mixed practice with worked reasoning.
Open practice →Chapter review
Cumulative chapter practice with revealable explanations
Open →Practice examination
Independent questions with separate answer key
Open →Complete solutions
Worked solutions and point information
Open →