Lesson 6

• “Let’s count to 100 by 10.”
• Record as students count. 
• Count to 100 by 10 2-3 times.

• “What patterns do you see?”
• 1-2 minutes: quiet think time
• Record responses.

• “Take turns counting to 100 by 10 with your partner.”
• “We will keep practicing counting to 100 by 10.”

The purpose of this lesson is for students to solve a Put Together/Take Apart, Both Addends Unknown story problem in the context of putting together pattern blocks (MP2). If students finish early, invite them to find multiple solutions to the story problem.

• Groups of 2
• Give students access to connecting cubes or two-color counters, 10-frames, and pattern blocks.
• Read and display the task statement.
• “Tell your partner what happened in the story.”
• 30 seconds: quiet think time
• 1 minute: partner discussion
• Monitor for students who accurately retell the story. Choose at least one student to share with the class.
• Reread the task statement.
• “Show your thinking using drawings, numbers, words, or objects.”

• 2 minutes: independent work time
• 2 minutes: partner discussion
• “If you haven’t already, write an expression to show how many square pattern blocks and triangle pattern blocks Diego used.”
• 2 minutes: independent work time

• Invite students who found different decompositions of 10 to share.
• As students share, record each solution with an equation, such as \(10 = 7 + 3\).
• “Did _____ and _____ both show what happened in the story? How do you know?” (Yes. They both have 10 pattern blocks, with some triangles and some squares.)
• “In the next activity, we will find more ways that we can make shapes with 10 pattern blocks.”

The purpose of this activity is for students to compose and decompose 10 in multiple ways in the context of putting together pattern blocks. In order to draw the shapes they created with pattern blocks, students may draw or trace each shape. Using different colored crayons (red for the red trapezoids, blue for the blue rhombuses) may help students differentiate between the shapes. Students are not expected to draw precise or accurate shapes. Students may use a combination of words, numbers, and colors to label and record how many of each pattern block they used in their book. In the activity synthesis, students look for patterns in equations and try to determine if all of the decompositions of 10 have been found (MP7).

• Create a book for each student from the blackline master.
• Create a chart labeled with “trapezoids” and “rhombuses” as pictured:

  

  

• Groups of 2
• Give students access to pattern blocks and 10-frames.
• “Work with your partner to put together 10 pattern blocks to make a shape. Use only blue rhombuses and red trapezoids.”
• 2 minutes: partner work time
• “Draw the shape that you created on the first page on your book.”
• 2 minutes: independent work time
• “What numbers or words can you use to describe the shape that you created?” (10 for the 10 pattern blocks. 6 for the 6 blue pattern blocks. 4 for the 4 red pattern blocks.)
• 30 seconds: quiet think time
• 1 minute: partner discussion
• Share responses.
• “At the top of the page, write a number to show how many pattern blocks you used altogether.”
• 30 seconds: independent work time
• “At the bottom of the page, write numbers or words to show how many red trapezoids and how many blue rhombuses you used.”
• 1 minute: independent work time

• “Now, you are going to create different shapes with 10 pattern blocks. Use only red trapezoids and blue rhombuses. Change the number of red trapezoids and blue rhombuses you use each time you make a new shape. Fill in a new page in your book for each new shape you create.”
• 15 minutes: partner work time

• Display the chart paper labelled with “trapezoids” and “rhombuses”.
• “Pick your favorite page in your book. How many blue rhombus pattern blocks and how many red trapezoid pattern blocks did you use to create the shape on your favorite page?”
• Share and record all student responses as equations on a chart. Record the responses systematically, as in:
  • \(10 = 1 + 9\)
  • \(10 = 2 + 8\)
  • \(10 = 3 + 7\)
  • \(10 = 4 + 6\)
  • \(10 = 5 + 5\)
  • \(10 = 6 + 4\)
  • \(10 = 7 + 3\)
  • \(10 = 8 + 2\)
  • \(10 = 9 + 1\)
• If a student shares a decomposition that was previously shared, point to the decomposition that was already listed.
• “What do you notice?” (Sample responses: The numbers in one column go up. The other numbers go down. We didn’t write an equation with 4 trapezoids.)
• If not all decompositions of 10 are listed, ask “Are there any ways to make 10 that are missing from our list? What makes you think that?” (There’s no 4 under the trapezoid. If we did 6 trapezoids and 4 rhombuses, maybe we could do 4 trapezoids and 6 rhombuses instead.)

The purpose of this activity is for students to learn stage 4 of the Shake and Spill center. Students use 3, 4, or 5 counters. They see some of the counters and determine how many more counters are under the cup. Students fill in expressions to represent each decomposition. Although determining the missing part of a total is not required by the standards, this activity helps students build fluency with addition and subtraction within 5. In a future variation of this center, students will play with up to 10 counters.

• Groups of 2
• Give each group of students a cup, 5 two-color counters, and 2 copies of the blackline master. 
• “We are going to learn a new way to do the Shake and Spill center. It is called Shake and Spill, Cover. Let’s play a round together.”
• “I am going to put 3 counters in the cup and shake them up. Before I spill the counters, you will close your eyes so I can cover all the yellow counters with the cup. Then you will open your eyes and figure out how many counters are under the cup.”
• Put 3 counters in a cup and shake them up.
• “Close your eyes.”
• Spill the counters and cover 1 yellow counter. Leave 2 red counters on the table.
• “Open your eyes. Look at the counters on the table. How many counters are under the cup? How do you know?” (One because there are 2 on the table and 2 and 1 more makes 3.)
• 30 seconds: partner discussion
• Share responses.
• Pick up the cup showing the 1 counter that was covered.
• “Now we fill in the recording sheet. We had 3 counters total. Then we fill in the expression that matches the parts we broke 3 into. There were 2 counters outside the cup and 1 counter in the cup.”
• Demonstrate completing the recording sheet.
• “Take turns with your partner spilling and covering the yellow counters. On each turn you can decide to use 3, 4, or 5 counters. Make sure you and your partner agree on how many total counters you are using before you shake, spill, and cover.”

• 10 minutes: partner work time

• Display \(1 + 3\).
• “Mai was playing Shake and Spill, Cover. She wrote this expression. What could her counters look like?” (1 yellow and 3 red or 3 red and 1 yellow.)
• If needed, ask “How many counters were under the cup? How many counters were out on the table?”