Lesson 4.1:
Break Apart Ones to Add: How does breaking apart a number make it easier to add?
Break Apart Ones to Add: How does breaking apart a number make it easier to add?
2.OA.1 Use addition and subtraction within 100 to solve one- and two-step word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem.