Unit 2: Adding and Subtracting within 100

Students add and subtract within 100 using strategies based on place value, properties of operations, and the relationship between addition and subtraction. They then use what they know to solve story problems.

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Concept

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Practice

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Set 1

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Set 2

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Advanced

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Set 1

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Set 2

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What this unit covers

A Add and Subtract · 4 lessons

Goals

• Add and subtract within 100 using strategies based on place value and the relationship between addition and subtraction. Equations and expressions in this section are limited to those like 17 + ___ = 48 or 65 − 23, where composing or decomposing a ten is not required.

Lessons

1. Add and Subtract to Compare
2. Find the Unknown Addend
3. Add or Subtract to Solve Story Problems
4. Center Day 1 (Optional)

B Decompose to Subtract · 6 lessons

Goals

• Subtract within 100 using strategies based on place value, including decomposing a ten and the properties of operations.

Lessons

1. Subtract Your Way
2. Compare Methods for Subtraction
3. Subtract 2 Digits
4. Different Ways to Decompose
5. Add and Subtract within 100
6. Center Day 2 (Optional)

C Represent and Solve Story Problems · 7 lessons

Goals

• Represent and solve one- and two-step problems involving addition and subtraction within 100, including different problem types with unknowns in all positions.

Lessons

1. How Do You Solve Story Problems?
2. Story Problems and Diagrams
3. Story Problems and Equations
4. Solve It Your Way
5. Does My Estimation Make Sense?
6. Center Day 3 (Optional)
7. Our Store's Inventory (Optional)

Helpful to know first

The curriculum says this unit builds on these.

Grade 2 Math · Unit 1 Adding, Subtracting, and Working with Data

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