2Ten Minute Math Today's Number: 219 Create an expression equal to 219. You must use only SUBTRACTION in each expression.Example: =219 and =219Describe and write about your strategies.
3Select a familiar array from the list created the day before. Example: Egg CartonWhat are the dimensions of an Egg Carton?What other ways can you think of to arrange 12 eggs into an array, besides 6 by 2 or 2 by 6?Is there another way to write 6x2?6 x 2 array of 12 eggs26
4Arrays of Twelve Factor 12x1, 1x12 Each of the dimensions of 12 are a factor of 12.That means12 can be divided by each of these numbers with no leftovers.What are the factors of 12?6x2, 2x63x4, 4x3
5Factor 1 2 3 4 6 12 Each of the dimensions of 12 are a factor of 12. As we identify the factors of twelve, write them in order in your math notebook and link the factors that go together to make 12.Do you notice that the dame factors occur twice and when we find one array, we can turn it to be the other? How many factors of 12 are there?1234612
6*Label each array with its dimensions (for example, 6 x4 and 4 x6) Making ArraysWork with a partner to complete a pair of arrays listed below (Every pair of students should have a different number pair). You may use your centimeter grid paper, locking cubes or color tiles to model the possible arrays. When you discover an array, cut it out of grid paper and add it to the construction paper labeled with that number.15 and and and 6424 and and and 5018 and and and 3829 and and and 7222 and 66*Label each array with its dimensions (for example, 6 x4 and 4 x6)
7DiscussionWhat are the smallest and largest factors that you found for your numbers? Could there be anything smaller? Larger? Why? Why not?Were there number that you knew wouldn’t work? Why?Why are there no factors between (half of the numbers) and (the number itself)?Example: Between 12 and 24 or 18 and 36?
8ClosureReview the following terms: factor, multiplication, array, and dimensions. How are they all relate to arrays. Create thinking map to display the related terms. Independent Practice: Complete student activity page 5 in math notebooks or on notebook paper.