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Warm Up

Warm Up. Write the EXPANDED form and tell the value of the RED digit in each number. 2 3 8 9 4 What are ALL the factors of 6?. 5. A. What are the dimensions of this egg carton? B. What are some other ways to arrange these eggs into arrays, besides the array you see above?.

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Warm Up

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  1. Warm Up • Write the EXPANDED form and tell the value of the RED digit in each number. • 23 • 894 • What are ALL the factors of 6? 5. A. What are the dimensions of this egg carton? B. What are some other ways to arrange these eggs into arrays, besides the array you see above? • 3. 1,256 - 898 • 4. 687 + 865

  2. Ten Minute Math Today's Number: 562 • How many different addition combinations can you use to create 562? • You must use multiples of 10 in each equation. • For example: 562= 500+50+10+2 • “How do you know this expression equals 562?” • “How did you combine the multiples of 10?” • Describe and write about your strategies.

  3. Elias runs a concession stand at the football stadium. The chart shows the cost of the items that Elias sells. Isabel spent exactly $4. She bought only one soda and 2 other items. What 3 items did she buy? Target the Question

  4. Making Arrays • Continue to work with a partner to complete a pair of arrays listed below.  • 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. • If you finish the arrays you were assigned, choose another set of numbers and find all of the arrays for those two numbers. 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)

  5. Discussion Let’s look at the following questions: • Which numbers have only one array? Why? • Which numbers have a square array? Why? • Which numbers have the most arrays? Why? As we discuss each of the about questions, please take notes in your math journal.

  6. Prime numbers 17, 19, 23, 29 How many factors do these numbers have? Prime Numbers are numbers with exactly two factors- 1 and the number itself. Composite Numbers are numbers with more than one array, or more that two factors. 17x1, 1x17 19x1, 1x19

  7. Square Numbers 16, 25, 36 and 49 What do you notice about these numbers? Their dimensions? Square numbers are have the same number for both dimensions. Can you name some other square numbers? How do you know they are square? 4 x 4 = 16 5 x 5 = 16

  8. How Many Groups? 3. ____ groups of 11 make 33 • ____ x 11 = 33 Draw the groups of 11 that would make 33. • ____ groups of 6 make 18 • ____ x 6 = 18 • How many cokes are in this case? • Explain how you came up with your answer in writing.

  9. Closure • Review the following terms: prime number, composite number and square number.  • How are they all relate to arrays?  • Create thinking map to display the related terms.  • Independent Practice: Complete student activity page 7 on actually sheet and student activity page 8 in math notebooks or on notebook paper. 

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