Lesson 14

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.

• Display one expression.
• “Give me a signal when you have an answer and can explain how you got it.”
• 1 minute: quiet think time

• Record answers and strategies.
• Keep expressions and work displayed.
• Repeat with each expression.

• “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 learn stage 3 of the Picture Books center. Students look through picture books and notice and describe shapes they see in the pictures. 

Each group of 2–4 needs at least one picture book that shows a variety of shapes throughout the book.

• 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 recording sheet, you will each sketch the shape you see, describe it, and name it.”

• 10 minutes: partner work time
• Monitor for different shapes students notice.

• “What shapes did you find most often?”

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

Gather materials from:

• Capture Squares, Stages 3–4
• Number Puzzles, Stages 2–4
• Picture Books, Stage 3

• “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

• 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

• “What did you like about the activities you worked on today?”