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http://illuminations.nctm.org/LessonDetail.aspx?ID=L117
A lesson plan for grades K–2 Mathematics
In this lesson, the second of a six-part Illuminations unit titled “Macaroni Math,” students explore the familiar set model of subtraction. The students write story problems and find differences using sets, including subtracting all and subtracting zero. They record the differences in a chart. Communication is a major focus in this lesson.
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.
Kindergarten
- Goal 1: Number and Operations - The learner will recognize, model, and write whole numbers through 30.
- Objective 1.03: Solve problems and share solutions to problems in small groups.
