Eureka Math
2nd Grade
Module 4
Lesson 4
At the request of elementary teachers, a team of Bethel & Sumner educators met as a committee to create Eureka slideshow presentations. These presentations are not meant as a script, nor are they required to be used. Please customize as needed. Thank you to the many educators who contributed to this project!
Directions for customizing presentations are available on the next slide.
Customize this Slideshow
Reflecting your Teaching Style and Learning Needs of Your Students
Screen A
“pop-out”
Screen B
Icons
Read, Draw, Write
Learning Target
Think Pair Share
Individual
Partner
Whole Class
Small Group Time
Small Group
Personal White Board
Problem Set
Manipulatives Needed
Fluency
I can add and subtract multiples of 10 and some ones within 100.
Materials Needed:
Fluency:
Concept Development:
Ones place
Fluency: Place Value (3 mins.)
What digit is in the TENS place?
174
7
What is the value of 7 in 174?
70
Say the value of 1 in 174?
100
What place is the 4 in?
Making a Ten Drill 2 mins.
6 + _____ = 10
4
If I say 6, you say 4...ready?
6….
16 + ____ = 20
4
Making the next Ten to Add 5 mins.
9 + 4 = _______
1 3
10
9 + 4 is the same as 10 + 3…
Answer: 13
Concept Development
How many in the bottom row? What is the difference between 8 and 5? (Hint: look at the red cubes)
There are two rows of five linking cubes shown in yellow. (Click) How many are there now on the top row?
8
3
What number sentence could I use to represent the difference between 8 and 5?
8 - 5 = 3
Concept Development
If I add another cube to each stick, has the difference changed?
Concept Development
Let’s represent that same problem with a drawing. We had 8 cubes on top, 5 on the bottom. The difference between the two sticks was 3.
Then, we added one more cube to each of the sticks. The difference was still 3.
3
3
Concept Development
Let’s try this one: 34 - 28
That one is pretty tough! Maybe we should start with 36 - 30.
Which one is easier? Why?
Concept Development
Let’s look at these as drawings:
34 - 28
36 - 30
Look at the two pictures. How are these two problems related? Talk with a partner.
Concept Development
Now it is your turn...
On your whiteboard, solve this problem by making a tape diagram. (Add on to both numbers to make the problem easier.)
22 - 8
Concept Development
The total number of cubes?
There are 6 red cubes on one end and 4 red on the other end. How many yellows in the middle?
Let’s make two different addition sentences. Join the one yellow with the 4 red. What is the addition sentence for the total number of cubes?
Answer: 6 + 5 = 11
Concept Development
Number Sentence: 6 + 5 = 11
Now let’s join the 1 yellow with the 6 red. What is our addition sentence?
Number Sentence: 7 + 4 = 11
How do you know this is true? Can you draw a tape diagram to show this is true?
Concept Development
Number Sentence: 6 + 5 = 11
Number Sentence: 7 + 4 = 11
Concept Development
28 + 36
By taking 2 from 36 and adding it to the 28, we make a much easier problem to solve.
Problem Set
Application Problem
Carlos bought 61 t-shirts. He gave 29 of them to his friends. How many t-shirts does Carlos have left?
Debrief
How did you label your tape diagram in Problem 1, Part (b)? Why?
Share your tape diagram for Problem 2, Part (b) with a partner. How did you label it to add tens?
Look at Problem 2, Part (c): 61 + 29 = 60 + 30. Is this true? How do you know?
What did you notice about the numbers in the problem set today?
Exit Ticket