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Activity 1

Standards Alignment

Building On

Addressing

Building Toward

Instructional Routines

Number Talk

Materials

None

Activity Narrative

The purpose of this activity is for students to reason about subtraction and write another subtraction expression to complete a partially-completed Number Talk routine. If there is time, students can facilitate their Number Talk with another group. Students are given three expressions and prompted to think of ways that they could be evaluated mentally. They then write a fourth expression, the value of which they could use similar reasoning, or the values of the first three expressions, to find.

MLR8 Discussion Supports. Synthesis: Create a display of the task. As students share their expression, annotate the display with the expression and its connection to the third expression in the Number Talk. For example, if students share , write “100 menos que 399” // “100 less than 399” next to the expression.
Advances: Reading, Representing

Launch

Groups of 2–4
“Estas son tres expresiones como las que podríamos ver en una rutina tipo ‘Conversación numérica’” // “Here are three expressions like the kinds you might see in a Number Talk.”

Activity

“¿Cómo encontrarían el valor de cada expresión, sin escribir? Piensen en al menos dos maneras de hacerlo para cada expresión. Después compartan con su grupo cómo pensaron” // “How would you find the value of each expression, without writing? For each expression, think of at least two ways. Then share your thinking with your group.”
Reiterate to students that they are to consider how someone might reason about each difference, rather than only find the value.
4 minutes: independent work time
4 minutes: small-group discussion
“Escriban una expresión más que, junto con las otras tres, pueda completar una rutina tipo ‘Conversación numérica’” // “Write one more expression that could go with the other three expressions to complete a Number Talk routine.”
4 minutes: small-group work time
Monitor for groups who consider the following strategies in writing their expression:
- Adjust the 399 to a different number, but keep the 500.
- Leave the 399, but adjust the 500.
- Adjust both the 500 and the 399, but create a problem that can be reasoned, as in previous expressions.
Identify groups, who chose different strategies, to share in the Activity Synthesis.

Estas son 3 expresiones de resta.

Piensa en al menos dos estrategias que sirvan para encontrar mentalmente el valor de cada diferencia.
Escribe una nueva expresión de resta que tenga un valor que se pueda encontrar usando una de las estrategias que pensaste.

Activity Synthesis

Select groups to share their last expression and their reasoning.
As each group shares, ask others in the class if they used the same strategy to write their expression and if they arrived at a similar expression.

Activity 2

Standards Alignment

Building On

Addressing

Building Toward

Instructional Routines

Number Talk

Materials

None

Activity Narrative

The purpose of this activity is for students to reason about addition and apply their reasoning to complete a partially-completed Number Talk routine. This time, students are given addition expressions and are asked to think about how the values of the sums could be found mentally. They then write two new addition expressions to complete the set.

Action and Expression: Internalize Executive Functions. To support working memory, provide students with access to sticky notes or mini whiteboards.
Supports accessibility for: Memory, Organization

Launch

Groups of 2–4
“Estas son dos expresiones como las que podríamos ver en una rutina tipo ‘Conversación numérica’” // “Here are two expressions like the kinds you might see in a Number Talk.”

Activity

“¿Cómo encontrarían el valor de cada expresión, sin escribir? Piensen en al menos dos maneras de hacerlo para cada expresión. Después compartan con su grupo cómo pensaron” // “How would you find the value of each expression, without writing? For each expression, think of at least two ways. Then share your thinking with your group.”
Reiterate to students that they are to consider how someone might reason about each sum, rather than only find the value.
3 minutes: independent work time
3 minutes: small-group discussion
“Escriban otras dos expresiones más que, junto con las otras dos, puedan completar una rutina tipo ‘Conversación numérica’” // “Write two more expressions that could go with the other two expressions to complete a Number Talk routine.”
5 minutes: small-group work time
Monitor for groups who consider the following strategies in writing their expression:
- Adjust the 504 to a different number, but keep the 199.
- Leave the 504, but adjust the 199.
- Adjust the 504 and the 199, but create a problem that can be reasoned as in previous expressions.
Identify groups, who chose different strategies, to share in the Activity Synthesis.

Estas son 2 expresiones de suma.

Piensa en al menos dos estrategias que puedes usar para encontrar mentalmente el valor de cada suma.
Escribe otras dos expresiones de suma que tengan un valor que se pueda encontrar usando las estrategias que pensaste.

Student Response

to access Student Response.

Advancing Student Thinking

Activity Synthesis

Select groups to share their two expressions and their reasoning.
As each group shares, ask others in the class if they used the same strategy to write their expressions and if they arrived at similar expressions.

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Audience

Assessment Access

Lesson 15

Conversación numérica

Warm-up

Instructional Routines

Materials

Activity Narrative

Launch

Activity

Student Response

Advancing Student Thinking

Activity Synthesis

Activity 1

Standards Alignment

Building On

Addressing

3.NBT.A.2

Building Toward

Instructional Routines

Materials

Activity Narrative

Launch

Activity

Activity Synthesis

Activity 2

Standards Alignment

Building On

Addressing

3.NBT.A.2

Building Toward

Instructional Routines

Materials

Activity Narrative

Launch

Activity

Student Response

Advancing Student Thinking

Activity Synthesis

Activity 3

Standards Alignment

Building On

Addressing

3.NBT.A.2

Building Toward

Instructional Routines

Materials

Activity Narrative

Launch

Activity

Student Response

Advancing Student Thinking

Activity Synthesis

Activity 4

Standards Alignment

Building On

3.NBT.A.2

Addressing

Building Toward

Instructional Routines

Materials

Activity Narrative

Launch

Activity

Student Response

Advancing Student Thinking

Activity Synthesis

Lesson Synthesis

Standards Alignment

Building On

Addressing

3.NBT.A.2

Building Toward

Student Response

Advancing Student Thinking