Warm Up
1.
What is the DIFFERENCE in the area
of the two rectangles below?
3 cm
6 cm
4 cm
3. Each number in Set A is related in the
same way to the number below it in Set B.
Set A
24
40
56
72
88
Set B
3
5
7
9
11
If the number in Set A is 48, what is one
way to find its related number in Set B?
7 cm
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?
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?
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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 9th 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 3
3
6
9
12
15
18
21
24
27
30
33
36
39
42
45
48
51
54
57
60
63
66
69
72
Let’s count around the class by
30.
Multiples of 30
30
60
90
120
150
180
210
240
270
300
330
360
390
420
450
480
510
540
570
600
630
660
690
720
These numbers are all multiples of 3, and 3 What do you notice about the list of
multiples of 30?
is a factor of all the numbers in this list.
Do you see any clues that could help us
What are the multiples of 30?
predict what would come next?
What are some ways that you would go
Do you see any relationships between the
about finding the multiples of 30?
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?
Building Multiple Towers
Starting Numbers for Multiple Towers
14 15 16 18 20
24 25 27 32 35
36 40 44 45 48
50 60 70
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