#### Unit Plan

## Addition and Subtraction Are Related

### Alignments:

### Grade Levels

### Related Academic Standards

### Assessment Anchors

### Eligible Content

### Big Ideas

### Concepts

### Competencies

### Objectives

This unit uses story problems to help students develop strategies for learning basic addition and subtraction facts and for computation using one- and two-digit numbers. Students are encouraged to demonstrate their thinking processes in computation, using a variety of methods and tools, including objects, pictures, number lines, and counting forward or backward. Students will:

- select and use appropriate operations to solve story problems.
- demonstrate multiple addition and subtraction strategies to solve single- and double-digit problems.
- use what they know about addition to help them with subtraction.

### Essential Questions

- How can expressions, equations and inequalities be used to quantify, solve, model, and/or analyze mathematical situations?
- How are relationships represented mathematically?

### Related Unit and Lesson Plans

### Related Materials & Resources

The possible inclusion of commercial websites below is not an implied endorsement of their products, which are not free, and are not required for this unit.

- http://www.ixl.com/math/grade/first/ (requires paid membership after reaching practice limit)
- www.nctm.org
- http://illuminations.nctm.org
- www.aaamath.com
- www.dr-mikes-math-games-for-kids.com
*Young Mathematicians at Work: Constructing Number Sense, Addition, and Subtraction*by Catherine Twomey Fosnot and Maarten Dolk. Heinemann, 2001.- www.oswego.org/ocsd-web/games/DogBone/gamebone.html interactive hundreds chart
- www.apples4theteacher.com/math.html#interactivenumbercharts interactive hundreds charts
- www.mathplayground.com/thinkingblocks.html story problems
*Navigating Through Number and Operations in Prekindergarten – Grade 2*by National Council of Teachers of Mathematics, Inc. NCTM, 2004.- http://illuminations.nctm.org/Activity.aspx?id=3566 How Many Under the Shell? game
- http://www.funbrain.com/linejump/index.html interactive number line addition activity

### Formative Assessment

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- Current Rating

### Community

### Comments

#### Elizabeth

The unit and lesson plans provide wonderful examples, ideas, and assessments to help first graders learn how to represent numbers in different ways! The related lessons are helpful in breaking down the information and supporting the understanding of number representations. I specifically like how hands-on manipulatives are used. The formative assessments in this lesson can easily be modified to provide students with many examples for representing numbers in different ways.

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