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Warm Up. Ten Minute Math. Today's Number: 219 Create an expression equal to 219. You must use only S UBTRACTION in each expression. Example: 239-20=219 and 250-30-1=219 Describe and write about your strategies. Select a familiar array from the list created the day before.

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Ten minute math
Ten Minute Math

Today's Number: 219

  • Create an expression equal to 219. You must use only SUBTRACTION in each expression.

    Example: 239-20=219 and 250-30-1=219

  • Describe and write about your strategies.


Select a familiar array from the list created the day before.

Example: Egg Carton

What 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 eggs

2

6


Arrays of Twelve before.

12x1, 1x12

  • Factor

  • 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, 2x6

3x4, 4x3


Factor
Factor before.

  • 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?

1

2

3

4

6

12


Making arrays
Making Arrays before.

  • Work 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 45 23 and 46 16 and 64

    24 and 48 17 and 34 25 and 50

    18 and 54 27 and 81 19 and 38

    29 and 58 21 and 42 36 and 72

    22 and 66

    *Label each array with its dimensions (for example, 6 x4 and 4 x6)


Discussion
Discussion before.

  • What 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?


Closure
Closure before.

  • Review 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. 


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