Workshop: Addition Strategies
Est. Class Sessions: 2–3Before the Lesson
The activities for Part 1 of the Workshop are in the Addition Strategies Practice pages in the Student Activity Book. You may choose to organize Mental Math Games in learning centers in Part 2 of the Workshop.
Review student work and progress from previous lessons to guide instructional decisions about the following Expectations:
| E1. | Use and apply place value concepts to make connections among representations of numbers to the thousands using base-ten pieces, number lines, expanded form, and standard form. |
| E3. | Add two-digit and three-digit numbers using mental math strategies (e.g., composing and decomposing numbers, counting on) using the 200 Chart, base-ten pieces, and number lines. |
| E4. | Add two-digit and three-digit numbers using paper-and-pencil methods (e.g., expanded form, all-partials, compact). |
| E6. | Estimate sums using mental math strategies (e.g., rounding using benchmarks, using friendly numbers, composing and decomposing numbers, counting on). |
In this Workshop, students will solve two- and three-digit addition problems using a variety of strategies. Some students may be more proficient with some strategies and not as confident with others. Students may continually use a strategy that they are comfortable with, but that may not be efficient. This Workshop provides problems that require students to use many different strategies. This gives them an opportunity to solve problems in ways that are natural to them and to discuss the pros and cons of various methods. Students should have a collection of methods that they find useful for solving problems, and they should understand the methods described by others. Students who are confident in using a variety of strategies will be able to begin to choose the strategy most efficient for any given problem. Students will also use estimation strategies to check the reasonableness of their solutions.