Warm Up 1.What is the DIFFERENCE in the area of the two rectangles below? 2. Mrs. Jacobs created 18 goody bags for her students. She put 10 pieces of candy in each bag. How many pieces of candy did she use for all 18 goody bags? 3. Each number in Set A is related in the same way to the number below it in Set B. If the number in Set A is 48, what is one way to find its related number in Set B? 4. Mrs. McDonald needs 94 eggs for a cake she is making. There are 6 eggs in each carton. How many cartons does she need to buy? 3 cm 4 cm 6 cm 7 cm Set A Set B

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Ten Minute Math Counting Around the Class by 40s. When a class finished counting, the last number was 840. How many students are in that class? What number did the 9 th person say? What number did the17th person say? Let’s count around our class by 40s…

Discussion: Multiples of 3 and 30 Who remembers the difference in a factor and a multiple? A factor- is the numbers you are skip counting by. Like if you count by 2s, then 2 is the factor of each number. A multiple- is the numbers you land on when you are skip counting. What are some multiples of 5? Of 10?

Discussion: Multiples of 3 and 30 Let’s count around the class by 3. I’ll list the multiples of 3 as we go. Multiples of These numbers are all multiples of 3, and 3 is a factor of all the numbers in this list. What are the multiples of 30? What are some ways that you would go about finding the multiples of 30? Let’s count around the class by 30. Multiples of What do you notice about the list of multiples of 30? Do you see any clues that could help us predict what would come next? Do you see any relationships between the multiples of 3 and 30?

Introducing Multiple Towers I need two volunteers… Imagine that we have boxes of oranges, each of which holds 30 oranges. We're going to pile these boxes up, one on top of the other, until they're as tall as one of the volunteers. But we want to keep track of how many oranges we have altogether each time we put a new box on to the tower. Stop at 13 cards …How many 30s do they have so far? Is there anything in our list that can help us know how many boxes we have with out counting each one? What number do you predict we'll land on when the tower is as high as his head? When the tower is complete… How many multiples are there in our finished tower? Try to figure out the number of multiples without counting them one by one. On the top card write the multiplication expression that corresponds to the multiple. Again without counting, which number in our tower is the 10th multiple of 30? Which is the 20th multiple? What would the 25th multiple be?

Starting Numbers for Multiple Towers Building Multiple Towers With a partner, choose a number from the list and build a multiple tower with sticky notes that is as tall as you or your partner. When you finish you will have some questions to answer about your tower.

Building Multiple Towers When your tower is complete, answer the following questions.

Math Menu Play Missing Factor Multiplication Migration