Objectives Students will identify and compare 2-D shapes. Students will understand the difference between congruent and similar shapes. Students will create and extend patterns. Students will combine shapes to create new shapes. Materials Needed Grandfather Tang’s Story: A Tale Told with Tangrams by Ann Tompert Tangrams template or Tangrams Tangram picture-matching cards or Tangram Picture Matching Cards Pattern blocks template or Pattern Blocks “Shapes Gallery” activity mat Scissors Paper & pencils Preparation: Print and copy the tangrams template, tangram picture-matching cards, pattern blocks template and “Shapes Gallery” activity mat. You will need one copy of each for each student. You can cut out the tangram shapes and pattern blocks in advance, or have students cut them out during the lesson. (You also can use the Pattern Blocks, Tangrams and Tangram Picture Matching Cards for this lesson.) Introduction Read aloud Grandfather Tang’s Story: A Tale Told with Tangrams. Show students the seven tangram shapes (two small triangles, two large triangles, one medium triangle, one square and one parallelogram). Tell students that tangrams originated in China. The story introduced only a few of the many shapes and figures that can be made with tangrams.
Objective Operations & Algebraic Thinking Using strategies to add and subtract fluently within 20 (e.g., counting on, making ten, decomposing or creating equivalent sums) Materials Needed “Make 10” frame Place Value Blocks Number line “Spin-To-Build” spinner “Build a Sum” record sheet Paper clips Pencils Introduction Pair students with partners, and give each pair 10 ones cubes and 1 tens rod from the Place Value Blocks set. Challenge students to see how many ways they can “make 10” in two minutes (e.g., 2 cubes + 8 cubes, 3 cubes + 7 cubes, etc.). Invite students to share their answers and compare. Provide the “Make 10” frame and have students complete it. Model the problem created in the frame. Ask, “How can I find out how to make 12? 14? 18? Can I start from 10? Is it faster?” Note: Use Place Value Blocks to show visual representations of two-digit numbers. For example, 14 is 1 tens rod and 4 ones cubes.
Objectives CCSS Math: Number & Operations in Base Ten 2.NBT.A.1: Understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones. 2.NBT.A.3: Read and write numbers to 1000 using base-ten numerals, number names, and expanded form. Materials Needed Whiteboard or chart paper Base 10 blocks (optional) Place Value Math Riddles reproducible and answer key Introduction Tell students you are going to write a number riddle and ask them to solve it. Try these riddles: “I am 200 + 30 + 6. What number am I?” (236) “I have 5 hundreds, 7 tens and 9 ones. What number am I?” (579) “I am 400 + 8. What number am I?” (408) “I have 3 tens, 4 hundreds and 1 one. What number am I?” (431) Note: Point out that the last two riddles were a bit tricky since one number didn’t have any tens, and the other one named the number of tens before naming the number of hundreds!
