Lesson:

Instructional Objective: SWBAT use partial-sums algorithm to solve addition problems; practice column-addition method. Mathematical Practices: SMP1, SMP2, SMP3, SMP5, SMP6, SMP7, SMP8. Focus on SMP3: Construct viable arguments and critique the reasoning of others. GMP3.2: Work to make sense of others’ mathematical thinking. ................
................