Unit 3, Lesson 21
Día 3 de centros
Grado 1
Warm-up
10 mins
¿Qué sabes sobre 20?
Standards Alignment
Building On
Addressing
Building Toward
1.OA.6
Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 - 4 = 13 - 3 - 1 = 10 - 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 - 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).
Instructional Routines
What Do You Know about _____?Materials
NoneActivity Narrative
The purpose of this What Do You Know about _____? is to invite students to share what they know about the number 20 and how they can represent its value.
Launch
- Display the number 20.
- “¿Qué saben sobre 20?” // “What do you know about 20?”
- 1 minute: quiet think time
Activity
- Record responses.
Student Task Statement
¿Qué sabes sobre 20?
Student Response
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Advancing Student Thinking
Activity Synthesis
- “¿Qué conexiones ven entre las diferentes respuestas?” // “What connections do you see between different answers?”
- Pick two addition expressions that use different addends and ask, “¿Cómo se relacionan estas dos expresiones?” // “How are these two expressions related?”
Activity 1
20 mins
Conozcamos “¿Qué tan cerca?: Suma para obtener 20”
Instructional Routines
NoneMaterials
To Copy (from Blackline Masters)
How Close? Stage 1 Recording Sheet, Spanish
Activity Narrative
The purpose of this lesson is for students to learn Stage 1 of the How Close? center. Students start with 5 number cards. For each round, they choose 3 of their cards to write an addition expression with three addends that has a value as close as possible to 20, the target number. The student with a sum closest to 20 gets a point for that round.
Activity 2
20 mins
Conozcamos “Cinco en línea: Suma 7, 8 o 9”
Instructional Routines
NoneMaterials
To Copy (from Blackline Masters)
Five in a Row Addition and Subtraction Stage 3 Gameboard, Spanish
Number Cards 0–10
Activity Narrative
The purpose of this activity is for students to learn Stage 3 of the Five in a Row center. Students pick a card and decide to add 7, 8, or 9 to the number on their card. They then place a counter on the sum on the gameboard. If a player can’t make a sum that is uncovered on the gameboard, they pick another card. The game ends when a player gets 5 counters in a row or the board is filled.
The gameboard will be used again in upcoming lessons. Consider copying it on cardstock or laminating it for future use.
MLR8 Discussion Supports. Synthesis: For each method that is shared, invite students to turn to a partner and restate what they heard using precise mathematical language.
Advances: Listening, Speaking
Advances: Listening, Speaking
Action and Expression: Develop Expression and Communication. Give students access to manipulatives such as connecting cubes, counters, or 10-frames.
Supports accessibility for: Conceptual Processing, Memory
Supports accessibility for: Conceptual Processing, Memory
Lesson Synthesis
“Hoy aprendimos dos juegos nuevos que podemos jugar en los centros” // “Today we learned two new games we can play during center time.”
“¿Cómo les fue trabajando con su pareja en los centros? ¿Qué salió bien? ¿Qué podemos mejorar?” // “How did you and your partner work together during centers? What went well? What can we continue to work on?”
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