Hopping backward on the number line
http://illuminations.nctm.org/LessonDetail.aspx?ID=L105
A lesson plan for grades 1–2 Mathematics
In this lesson, one of a seven-part unit from Illuminations titled “Links Away,” students generate differences using the number line model. Because this model highlights the measurement aspect of subtraction, it is a distinctly different representation from the models presented in lessons one and two. The order property for subtraction is investigated. At the end of the lesson, children are encouraged to predict differences and answer puzzles involving subtraction.
North Carolina Curriculum Alignment
Mathematics (2004)
Grade 1
- Goal 1: Number and Operations - The learner will read, write, and model whole numbers through 99 and compute with whole numbers.
- Objective 1.03: Develop fluency with single-digit addition and corresponding differences using strategies such as modeling, composing and decomposing quantities, using doubles, and making tens.
- Objective 1.04: Create, model, and solve problems that use addition, subtraction, and fair shares (between two or three).
Grade 2
- Goal 1: Number and Operations - The learner will read, write, model, and compute with whole numbers through 999.
- Objective 1.03: Create, model, and solve problems that involve addition, subtraction, equal grouping, and division into halves, thirds, and fourths (record in fraction form).
- Objective 1.05: Create and solve problems using strategies such as modeling, composing and decomposing quantities, using doubles, and making tens and hundreds.
