Module 6 Lesson 13.

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Presentation transcript:

Module 6 Lesson 13

Objective Use square tiles to decompose a rectangle.

Making the Next Ten to Add When I say 9 + 4, you say 10 + 3. Ready? 9 + 4 Answer? 19 + 4 8 + 5 8 + 3 29 + 4 18 + 5 18 + 3 29 +14 18 + 15 18 + 13 59 + 14 38 + 15 7 + 4 9 + 6 7 + 6 17 + 4 19 + 6 17 + 6 67 + 4 19 + 16 17 + 16 49 + 16 37 + 16

Core Fluency Practice Sets On your mark, get set, THINK! Time for 2 minutes.

Concept Development With your partner, use the tiles in your bag to construct a rectangle with 4 rows of 5 on your personal board. Tell your partner the total number of tiles in your rectangle and how you know. Write the number of rows and the number in each row as the whole in your number bond as I do. How can we decompose this rectangle into two equal parts? Turn and talk. Use your ruler to break your rectangle into two equal parts as I do. Materials: (S) Bag with 25 square tiles, personal white board with insert, ruler

Concept Development How many tiles in each row? Write 2 rows of 5 for each part of your number bond. If 5 + 5 + 5 + 5 represented the rectangle before we decomposed it, what number sentence can you use to describe each part? Write 5 + 5 = 10 below the parts of the number bond. Tell your partner the two parts and the whole using a number sentence. Repeat the process with 6 columns of 2, decomposing by columns rather than by rows.

Concept Development With your partner, count out 16 tiles. Then construct a rectangle on your desk with 4 rows. How many rows did you make? How many tiles are in each row? Say the number sentence. What do 4 rows of 4 equal? Turn and talk, what is the new total for the rectangle and how do you know? Remove one column. How many tiles do you have now, and how do you know? Turn and talk. Circulate as students work. Repeat the above process with a rectangle of 25 tiles.

Application Problem Ellie bakes a square pan of 9 lemon bars. Her brothers eat 1 row of her treats. Then her mom eats 1 column. Draw a picture of Ellie’s lemon bars before any are eaten. Write a number sentence to show how to find the total. Write an X on the bars that her brothers eat. Write a new number sentence to show how many are left. Draw a line through the bars that her mom eats. Write a new number sentence to show how many are left. How many bars are left? Write a statement.