Description: In Lessons 4 and 5, students count by sixes and sevens, composing up to and then over the next ten. Eventually, students are able to use mental math as they manipulate numbers and skip-count to multiply. For example, students might count 6, 12, 18, and then mentally add 18 + 2 + 4 to make 24. This skip-counting method utilizes make ten strategies from Grades 1 and 2. Initially, students use number bonds to decompose and identify appropriate number pairs. Lesson 6 builds on Lesson 2 with a formal re-introduction of the distributive property using the 5 + n pattern to multiply and divide. Students understand that multiples of 6 can be thought of as (5 + 1) × n to make 5 and 1 more groups, or 6 groups of n.