How many more?
http://illuminations.nctm.org/LessonDetail.aspx?ID=L75
A lesson plan for grades K–2 Mathematics
In this lesson, one of a six-part unit from Illuminations titled “How Many More Fish?,” students write subtraction problems, model them with sets of fish-shaped crackers, and communicate their findings in words and pictures. They record differences in words and in symbols. The additive identity is reviewed in the context of comparing equal sets. Communication and problem solving skills are used 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 4: Data Analysis and Probability - The learner will collect, organize and display data.
- Objective 4.01: Collect and organize data as a group activity.
- Objective 4.02: Display and describe data with concrete and pictorial graphs as a group activity.
