Lesson 14
Solve It Your Way
Warmup: Number Talk: Multiple Addends (10 minutes)
Narrative
Launch
 Display one problem.
 “Give me a signal when you have an answer and can explain how you got it.”
 1 minute: quiet think time
Activity
 Record answers and strategy.
 Keep expressions and work displayed.
 Repeat with each expression.
Student Facing
Find the value of each expression mentally.
 \(5 + 9 + 5\)
 \(25 + 9 + 5\)
 \(25 + 15 + 19\)
 \(25 + 30 + 15 + 19\)
Student Response
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Activity Synthesis
 “How did you choose which numbers to add first?” (I looked for ways to make a ten. I looked for ways to use sums I’ve done before. I added tens first then I tried to make tens with the ones.)
Activity 1: Put It All Together (15 minutes)
Narrative
The purpose of this activity is for students to represent and solve a twostep story problem. The story problem is presented in parts, and students are encouraged to represent each part in a way that makes sense to them. In the synthesis, students compare different ways they represent and solve the problem (MP2).
Advances: Conversing, Representing
Required Materials
Materials to Gather
Launch
 Groups of 2
 Give students access to connecting cubes and baseten blocks.
Activity
 “Read each problem with your partner and solve it on your own. Show your thinking using diagrams, equations, or words.”
 5 minutes: independent work time
 5 minutes: partner discussion
 Monitor for students who use tape diagrams and equations to represent each problem.
Student Facing

Andre gathered seeds. He has 25 sunflower seeds and 17 squash seeds. How many seeds does he have? Show your thinking.

Andre gathered more seeds. He has 35 cucumber seeds. How many seeds does Andre have altogether? Show your thinking.

Compare your thinking with your partner.
Student Response
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Activity Synthesis
 Invite previously identified students to share their tape diagram and equation for each part.
 “How did _____ represent the problem? How does each representation show the story problem?”
 Display \(25 + 17 + 35 = {?}\)
 “How does this equation represent Andre’s seeds?” (It shows all the seeds he has in one equation.)
 “What are other ways we could add to find the sum?” (We could add 25 and 35 first. Then add 17. We could add 17 and 35 and then add 25.)
Activity 2: Select, Solve, and Share (20 minutes)
Narrative
The purpose of this activity is for students to represent and solve one and twostep story problems using methods that make the most sense to them. Students each select a problem to solve on their own and share their work with their group. Each group uses the solutions to solve a twostep Put Together, Result Unknown problem. Students have multiple opportunities to describe and compare the different ways their peers represent and solve story problems (MP2, MP3, MP6).
This activity uses MLR7 Compare and Connect. Advances: representing, conversing.
Supports accessibility for: Conceptual Processing, Organization, Attention
Required Materials
Materials to Gather
Launch
 Groups of 3
 Give students access to baseten blocks.
Activity
 “Read the problems together. Each person in your group must solve one problem on their own. Decide together who will solve each problem. Be ready to share your thinking with your group.”
 “After everyone shares and you agree on how many seeds each character has, complete the story and solve the problem together.”
 4 minutes: independent work time
 5 minutes: smallgroup discussion
Student Facing

Decide which problem each member of your group will solve.
 Priya has 24 fewer seeds than Tyler. Tyler has 53 seeds. How many seeds does Priya have?
 Jada and Mai have 61 seeds. Jada has 39 seeds. How many seeds does Mai have?
 Kiran started the game with 24 seeds. He won 17 seeds on his turn. How many seeds does he have now?
 Solve the problem. Show your thinking.

Share your thinking with your group. After everyone has shared, complete the sentences with your answers. Then solve the story problem together.

Priya has ____________ seeds.

Mai has ____________ seeds.

Kiran has ____________ seeds.
How many seeds do they have in all?

Student Response
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Activity Synthesis
MLR7 Compare and Connect
 Give each group a piece of chart paper and markers.
 “Create a visual display that shows your thinking about the story problem you solved as a group. You may want to include details such as drawings, diagrams, equations, and labels to help others understand your thinking.”
 5–7 minutes: gallery walk
 “What is the same and what is different between the different ways we made sense of and solved the story problem?” (Some groups used more than one tape diagram and equation to represent the problem. Some groups used one equation. We added the characters seeds in different ways. We used different ways to show how we added.)
 30 seconds quiet think time
 1 minute: partner discussion
Lesson Synthesis
Lesson Synthesis
“In this section, we practiced making sense of and solving different kinds of story problems and using what we know about adding and subtracting twodigit numbers.”
“What do you do to make sense of and solve story problems?”
“What ideas for solving story problems have you learned from others?”
Cooldown: Jada’s Seeds (5 minutes)
CoolDown
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Student Section Summary
Student Facing
In this section, we solved many different kinds of story problems. We used diagrams and equations to make sense of problems.
Jada started with some seeds. Then she won 28 seeds from Elena. Now she has 65 seeds.
How many seeds did Jada have at the start?
\({?} + 28 = 65\)
We shared how we make sense of story problems, how we solve them, and what we learned from each other.