Unit 1.1 Developing Fact Fluency
Learning Objectives
Students will be able to:
*Add and subtract within 20 using the mental strategy of counting on.
*Add and subtract within 20 using the mental strategy of using then relationship between addition and subtraction.
*Add and subtract within 20 using the mental strategy of decomposing a number leading to a ten
*Add and subtract within 20 using the mental strategy of creating equivalent but easier or known sums.
*Demonstrate the understanding of the concepts and skills learned in this unit
***Mental strategies include: counting on, making ten, decomposing a number leading to a ten, using the inverse relationship between addition and subtraction, creating equivalent but easier or known sums.
Common Core State Standards being addressed:
Operations and Algebraic
Thinking 2.OA
Add and subtract within 20.
*2.OA.2 Add and subtract within 20 using mental strategies. By end of Grade 2, know from memory
all sums of two one-digit numbers.
Key Vocabulary
mental
strategy
total
decompose
compose
inverse
equivalent
Essential Questions
When would you use counting on as a strategy?
How could you use a known fact to add 6 + 7?
How could you use decomposition to help you solve 13 – 4?
What are two different strategies for adding ____(example: 8 and 6)?
What strategy could you use to add/subtract this sum mentally?
Students will be able to:
*Add and subtract within 20 using the mental strategy of counting on.
*Add and subtract within 20 using the mental strategy of using then relationship between addition and subtraction.
*Add and subtract within 20 using the mental strategy of decomposing a number leading to a ten
*Add and subtract within 20 using the mental strategy of creating equivalent but easier or known sums.
*Demonstrate the understanding of the concepts and skills learned in this unit
***Mental strategies include: counting on, making ten, decomposing a number leading to a ten, using the inverse relationship between addition and subtraction, creating equivalent but easier or known sums.
Common Core State Standards being addressed:
Operations and Algebraic
Thinking 2.OA
Add and subtract within 20.
*2.OA.2 Add and subtract within 20 using mental strategies. By end of Grade 2, know from memory
all sums of two one-digit numbers.
Key Vocabulary
mental
strategy
total
decompose
compose
inverse
equivalent
Essential Questions
When would you use counting on as a strategy?
How could you use a known fact to add 6 + 7?
How could you use decomposition to help you solve 13 – 4?
What are two different strategies for adding ____(example: 8 and 6)?
What strategy could you use to add/subtract this sum mentally?