This Number Talk encourages students to think about adding multiples of 5 to other multiples of 5 and to look for ways to use the structure of the base-ten system and the properties of operations to mentally solve problems (MP7). The strategies elicited here help students develop fluency with addition within 1,000.
Launch
Display one expression.
“Give me a signal when you have an answer and can explain how you got it.”
1 minute: quiet think time
Activity
Record answers and strategies.
Keep expressions and work displayed.
Repeat with each expression.
Find the value of each expression mentally.
Student Response
Loading...
Advancing Student Thinking
Activity Synthesis
“How can you tell which sums will have 0 ones and which sums will have 5 ones?”
The purpose of this activity is for students to revisit Stage 3 of the Picture Books center. The center was introduced in Kindergarten, and the stage was introduced in Grade 1. Students look through picture books and notice shapes they see in the pictures. Students describe, name, and draw a picture of the shapes they see.
Launch
Groups of 2
Give each student a recording sheet and each group 2–4 picture books.
“We are going to learn a new way to do the Picture Books center.”
“Your group will look through picture books and notice and describe shapes you see in the pictures. On your own recording sheet, each of you will sketch the shape you see, describe it, and name it.”
The purpose of this activity is for students to choose from activities that focus on adding and subtracting within 100. Students may also choose to continue working on Picture Books as one of their choices.
Students choose from any stage of previously introduced centers.
Capture Squares
Number Puzzles
Picture Books
Launch
“Now you will choose from centers we have already learned. One of the choices is to continue with Picture Books.”
Display the center choices in the student book.
“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.
10 minutes: center work time
“Choose what you would like to do next.”
10 minutes: center work time
Choose a center.
Capture Squares
Number Puzzles
Picture Books
Student Response
None
Advancing Student Thinking
Activity Synthesis
“What did you like about the activities you worked on today?”
Lesson Synthesis
“Today we looked for shapes in books and our classroom. What is something you noticed as you looked for shapes?”
Standards Alignment
Building On
Addressing
2.NBT.B.5
Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.