Up board solutions class 6 math chapter 2 July 8, 2019 16 32 64 128 Illustrative mathematics grade 6 unit 6 lesson 5 Unit 4 lesson 6 practice problems 6th grade Unit 4 lesson 6 cumulative practice problems Grade 6 unit 2 lesson 6 practice problems Illustrative mathematics grade 6 unit 6 lesson 6