# T4T 12 Ways to Get to 11

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*Lesson excerpt:*

**NC
Mathematics Standard(s):**

**Operations and Algebraic Thinking**

**NC.2.OA.1 Represent and solve addition and subtraction word
problems, within 100, with unknowns in all positions, by using representations
and equations with a symbol for the unknown number to represent the problem,
when solving:**

● **One-Step problems:**

o
**Add
to/Take from Start Unknown**

o
**Compare-Bigger
Unknown**

o
**Compare-Smaller
Unknown**

● **Two-Step problems involving single
digits:**

o
**Add
to/Take from- Change Unknown**

o
**Add
to/Take from- Result Unknown**

** **

** NC.2.OA.2 Demonstrate fluency with addition
and subtraction, within 20, using mental strategies.**

** **

** **

**Additional/Supporting
Standards:**

**NC.2.NBT.5
Demonstrate fluency with addition and subtraction, within 100, by:**

● **Flexible using strategies based on
place value, properties of operations, and/or the relationship between addition
and subtraction.**

● **Comparing addition and subtraction
strategies, and explaining why they work.**

● **Selecting an appropriate strategy in
order to efficiently compute sums and differences.**

**Standards
for Mathematical Practice:**

1. Make sense of problems and persevere in solving them.

4. Model with mathematics.

6. Attend to precision.

7. Look for and make use of structure.

**Student
Outcomes:**

● I can use strategies to solve addition word problems.

● I can write and solve an equation with more than two addends.

** **

** **

** **

**Math
Language:**

**What
words or phrases do I expect students to talk about during this lesson?** Students will be using vocabulary from both
first and second grade such as: add, equal, addend, sum, and putting together.

**Materials:**

●
*12 Ways to
Get 11 *by Eve Merriam

● Chart paper or board

● 12 x18 white construction paper (one piece for each partner group)

● Crayons or Markers for partner groups

● Baggies with 20 Unifix or Snap cubes for each partner group

**Advance
Preparation**:

● Gather enough 12 x 18 construction paper for your class booklet

● Make baskets of crayons or markers for partners

● Make baggies with 20 Unifix or Snap cubes

**Launch:**

1.
(20 minutes) Have students gather on
the carpet to listen to a story. Tell
students that you will be reading a story about addition. Ask students, “What is addition?” Listen to possible answers. Then begin to
read aloud the story *12 Ways to Get
11. *Each page has a different
equation to get to 11. Have students
tell you the equation after reading each page and record their answers on the
chart paper. During the book, stress how
many different ways that the characters get the “sum” of 11.

**Explore:**

1. (45 minutes) Ask students to return to their seats. Tell students, “Today we are going to explore how

many ways we can come up with the sum of 20, using more than 2 addends. Select partner groupings.

Hand out the baggies of cubes, one for each group. Have students use their cubes to come up with

different ways to get to 20 using more than 2 addends. (ex. 5+3+4+8=20) After partners have a

chance to explore different ways to make 20, choose 10 different equations to write on the board. Pass

out one sheet of 12x18 construction paper to each group. The groups may then choose one equation to

illustrate for the class book *10
Ways to Get 20. *Have each group
write the equation at the top of the

page. Then write a story problem to match the equation. They can also illustrate their story problem.

After
all groups are finished with their page, combine all pages and add a title page
that reads, *10 Ways to *

* Get 20.*

**Discuss:**

1.
(10 minutes) Come together as a class to the carpet and
read your class book, *10 Ways to Get 20.* Have

students discuss how they came up with their equations using the cubes. What would you do differently if

you had no cubes?

**Informal
Evaluation: **As each partner group is working,
walk around to monitor how students finding their equations and solving
them. Make sure that the story problem
matches the equation.

**Formal
Evaluation/Exit Ticket: **The exit ticket is the completed
page for the class book that has the correct equation, story problem and
illustration.

**Meeting
the Needs of the Range of Learners**

**Intervention: **Some students may struggle with
equations with more than two addends.
You may want to start with a stick of 10 unifix cubes instead of 20 to
make equations that add up to 10.

**Extension:
**An extension could be that groups have a card with a certain
number like 35 with no cubes and they have to come up with the equations with a
sum of 35, or a number of your choice.