Balancing equations
http://illuminations.nctm.org/LessonDetail.aspx?ID=L77
A lesson plan for grades K–2 Mathematics
This lesson, one of a six-part unit from Illuminations titled “How Many More Fish?,” encourages students to explore another meaning for operations of subtraction, the balance. This meaning leads naturally to recording with equations. The students will imitate the action of a pan balance and record the modeled subtraction facts in equation form.
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.
