Module 6 Lesson 15. Objective Use math drawings to partition a rectangle with square tiles, and relate to repeated addition.

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Presentation transcript:

Module 6 Lesson 15

Objective Use math drawings to partition a rectangle with square tiles, and relate to repeated addition.

Sprint: Subtract Crossing the Ten ( Start sprint A, Ready, Think! Start sprint B, Ready, Think!

Using the Nearest Ten to Subtract Raise your hand when you know the Break 16 apart into 10 and 6. What is 10 – 9? is…? So, = ? Now try: –

Application Problem Rick is filling his muffin pan with batter. He fills 2 columns of 4. One column of 4 is empty. Draw to show the muffins and the empty column. Write a repeated addition equation to tell how many muffins Rick makes = 8 Rick makes 8 muffins

Concept Development Remind me what we discovered in the last lesson when we worked with rectangle. If you said We can cut up a rectangle into rows and columns. There are lots of small squares inside the rectangle. There are smaller numbers inside bigger numbers. So we learned that smaller units combine to make larger units, and larger units can be decomposed into smaller units. We’re going to use the Problem Set again for today’s lesson

 Problem 1 says shade, or color in, an array with 2 rows of 3. Are we going to color in the whole rectangle? Starting in the upper left corner, how many squares are we going to color in the first row?  3 squares! Let’s color that first row green. What should we do next?  Color in another row of 3 under the first row.  Yes! Do that with me, this time using a different color.

 Now, tell your partner what you see.  If you said  I see 2 rows of 3  I see 6 colored squares  I see 2 threes.  What’s the related repeated addition to the array. There are 2 threes, so Let’s write that on the line next to the array.

Let’s do Problem 2. How many rows are we going to color? 4 rows! How many squares in each row do we need to color? 3 squares! Color in an array that shows 4 rows of 3. Use a different color for each row. Now, write the repeated addition equation for the array, and share what you wrote with your partner = 12.

Let’s do Problem 3. How many columns are we going to color? 5 columns! How many squares should we color in each column? 4 squares! All right, color in 5 columns of 4. Again, use a different color for each column.

Look at Problem 4. Draw one more column of 2 to make a new array. Are we adding another row or another column? Another column! Good now, draw another column of 2. How many columns are there now? 5 columns! How many in each column? 2 squares. Yes! Each column has a group, or unit, of two! How many twos are there altogether? 5 twos! What is a repeated addition equation for the new array? = 10

Problem Set Now it’s your turn. Finish the rest of the problem set on your own.