The purpose of this True or False? is to elicit strategies and understandings students have for adding with multiples of 2 and with two equal addends. These understandings help students deepen their understanding of the properties of operations, and gain fluency within 20. These practices will also help students develop foundations for multiplication.
Launch
Display one statement.
“Hagan una señal cuando sepan si la afirmación es verdadera o no, y puedan explicar cómo lo saben” // “Give me a signal when you know whether the statement is true and can explain how you know.”
1 minute: quiet think time
Activity
Share and record answers and strategies.
Repeat with each statement.
Decide si cada afirmación es verdadera o falsa. Prepárate para explicar tu razonamiento.
Student Response
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Advancing Student Thinking
Activity Synthesis
“¿Cómo pueden explicar su respuesta sin encontrar el valor de ambos lados?” // “How can you explain your answer without finding the value of both sides?”
The purpose of this activity is for students to have another chance to practice skip-counting by 2, 5, and 10 and adding and subtracting within 1,000.
Launch
“Ahora van a escoger centros de los que ya conocemos” // “Now you will choose from centers we have already learned.”
Display the center choices in the student book.
“Piensen qué les gustaría hacer primero” // “Think about what you would like to do first.”
30 seconds: quiet think time
Activity
Invite students to work at the center of their choice.
15–20 minutes: center work time
“Escojan qué les gustaría hacer ahora” // “Choose what you would like to do next.”
15–20 minutes: center work time
If time allows, students can choose a third center to work on.
Escoge un centro.
Escribe números
Números objetivo
Cinco en línea
¿Qué tan cerca?
Student Response
None
Advancing Student Thinking
Activity Synthesis
Invite 2-3 students to share their favorite method for adding and subtracting within 1,000.
Lesson Synthesis
“Este año hemos aprendido mucho sobre la suma y la resta. ¿Qué cosas importantes debemos recordar sobre la suma y la resta?” // “We have learned a lot about addition and subtraction this year. What are some important things we need to remember about addition and subtraction?”
“¿Qué preguntas tienen sobre la suma y la resta?” // “What questions do you have about addition and subtraction?”
Standards Alignment
Building On
2.OA.C
Work with equal groups of objects to gain foundations for multiplication.
Fluently add and subtract within 20 using mental strategies.See standard 1.OA.6 for a list of mental strategies. By end of Grade 2, know from memory all sums of two one-digit numbers.