Curriculum Library

Operations & Algebraic Thinking Unit 1: Understand Addition and Subtraction

Key Concept: Quantities that are joined are added and quantities that are separated are subtracted.

Lesson Sequences

O.1-1-1 Act Out Join Word Problems to 5  |
View Teacher-Facilitated Lesson Students use a concrete model to physically solve join word problems.  (35-45 min)
O.1-1-2 Join Word Problems to 5  |
View Teacher-Facilitated Lesson Students use manipulatives to represent addition word problems to 5. (35-45 min)
O.1-1-3 Act Out Separate Word Problems to 5  |
View Teacher-Facilitated Lesson Students use a concrete model to physically solve separate word problems.  (35-45 min)
O.1-1-4 Separate Word Problems to 5  |
View Teacher-Facilitated Lesson Students use manipulatives to represent subtraction word problems to 5.  (35-45 min)
Key Concept: Addition and subtraction can be used to solve join and separate problems.

Lesson Sequences

O.1-2-1 Decide Whether to Add or Subtract  |
Lesson Plan
View Teacher-Facilitated Lesson Students build their understanding of addition and subtraction by analyzing word problems and determining which operation is required in order to solve. (35-45 min)
O.1-2-2 Solve Join and Separate Word Problems to 5  |
Lesson Plan
View Teacher-Facilitated Lesson Students apply their understanding of addition and subtraction in order to solve join and separate word problems to 5.  (35-45 min)
Key Concept: Quantities can be composed and decomposed in different ways.

Lesson Sequences

O.1-3-1 Compose Numbers to 5  |
Lesson Plan
View Lesson Opener Hands-On (5-10 min)
View Guided Lesson Students build their understanding of composition of quantities within 5 through solving put together word problems. (12-20 min)
View Lesson Closer Math Musings (5-8 min)
O.1-3-2 Decompose Numbers Within 5  |
Lesson Plan
View Lesson Opener Hands-On (5-10 min)
View Guided Lesson Students build their understanding of decomposition of quantities within 5 through solving take apart word problems. (12-20 min)
View Lesson Closer Math Musings (5-8 min)
O.1-3-3 Compose and Decompose Within 5  |
Lesson Plan
View Lesson Opener Hands-On (5-10 min)
View Guided Lesson Students extend their understanding of composition and decomposition within 5 and begin to understand the relationship between these operations. (12-20 min)
View Lesson Closer Math Musings (5-8 min)
O.1-3-5 Decompose Numbers Multiple Ways Within 5  |
Lesson Plan
View Teacher-Facilitated Lesson Students build flexibility in their understanding of quantity through decomposing numbers within 5 in multiple ways. (35-45 min)
Key Concept: The quantities of 5 and 10 can be used as benchmarks to strategically add and subtract.

Lesson Sequences

This topic is still in development.

Key Concept: An equation represents a relationship between quantities.

Lesson Sequences

This topic is still in development.