#### Lesson Plan

## Goal Number

### Alignments:

### Grade Levels

### Related Academic Standards

### Assessment Anchors

### Eligible Content

### Big Ideas

### Concepts

### Competencies

### Objectives

This lesson encourages children to explore and to develop a broader understanding of subtraction and the relationship of addition and subtraction. Students will:

- use addition and subtraction strategies.
- write equations/number sentences to represent their thinking.
- explore different operations to strategize and reach the goal number.

### Essential Questions

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

### Vocabulary

**Subtraction:**To take one quantity away from another.

### Duration

50 minutes

### Prerequisite Skills

Prerequisite Skills hasn't been entered into the lesson plan.

### Materials

- numeral cards 0–20. (M-1-3-3_Numeral Cards.doc)
- copies of Goal Number Recording Sheet (M-1-3-3_Goal Number Recording Sheet.doc)
- ten-frames or twenty-frames, one per student plus extras to have available (M-1-3-3_Twenty-Frames.doc)
- number line, one per student (M-1-3-2_Number Line.doc)
- Classroom manipulatives such as connecting cubes, snap cubes, small blocks, base-ten blocks, chips, etc. should be available for students to use if they so choose.

### 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 lesson plan.

*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

### Formative Assessment

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### Suggested Instructional Supports

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