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.

How are relationships represented mathematically?

How can expressions, equations, and inequalities be used to quantify, solve, model, and/or analyze mathematical situations?

How can mathematics support effective communication?

How can patterns be used to describe relationships in mathematical situations?

How can recognizing repetition or regularity assist in solving problems more efficiently?

How is mathematics used to quantify, compare, represent, and model numbers?

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

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

50 minutes

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

- 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.

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.

- 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.

Instructional videos haven't been assigned to the lesson plan.

Final 3/14/14

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