Addition word problems - math grade 2 - lesson 15

Today we are going to solve some story problems. I know you solved story problems last year. Lean and Whisper to your Shoulder Partner what you remember about solving story problems. Give me a Thumbs Up when you are ready to share your thinking.

Addition word problems

Math4u grade 2 first term

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Mathematics Teacher`s Guide primary 2

Addition word problems - math grade 2 - lesson 15

Math primary 2 first term lesson 15

Learn (40 minutes)

Directions

Note to the Teacher: For the Learn section today, students will Apply the strategies they have been learning to solve addition story problems. Students may use any of the mental math strategies they have practiced over the past few days.

STUDENTS DO: Lean and Whisper what they remember about solving story problems to their Shoulder Partner. Give a Thumbs Up when they are ready. Selected students discuss what they remember about solving story problems.

TEACHER SAY: A story problem is a math problem that tells a story and gives us a math problem to solve. Today we are going to use mental math strategies solve some story problems. Let’s review the strategies.

TEACHER DO: Use Calling Sticks to select a student to read the strategies listed on the Mental Math Strategies poster.

2.TEACHER SAY: Listen to the first story problem carefully because we will not be taking out a pencil and paper. In the morning, Fatima collected 6 flowers from her garden. In the afternoon, she gathered 7 more flowers from her garden. How many flowers did Fatima have in all? Think for a moment about the problem. Then I am going to ask you some questions about it.

STUDENTS DO: Think quietly about the problem for about 30 seconds.

TEACHER DO: Use Calling Sticks to select students to answer the questions below. Record their answers on the board.

• How many flowers did Fatima first collect from her garden? (6)
• How many more did she gather? (7)

STUDENTS DO: Selected students answer the questions aloud.

TEACHER SAY: What mental math strategy could we use to find out how many flowers Fatima has in all? Lean and Whisper the answer to your Shoulder Partner. Give me a Thumbs Up if you and your partner have an answer.

STUDENTS DO: Lean and Whisper the answer to their Shoulder Partner. Give a Thumbs Up to volunteer. Selected students answer the question.

TEACHER SAY: We can add the two numbers using either the mental math strategy Doubles or Counting On. Now, use one of the strategies to solve the problem with your Shoulder Partner. Give me a Thumbs Up when you have an answer.

STUDENTS DO: Solve the problem with their Shoulder Partner. Give a Thumbs Up when they have an answer. Selected partners share their answer and explain how they used a mental math strategy to solve the problem.

TEACHER SAY: Raise your hand if you used a different mental math strategy to solve the problem.

STUDENTS DO: Raise their hands if they used a different mental math strategy to solve the problem. Selected partners explain the different mental math strategy they used.

TEACHER DO: If the students’ answers are incorrect, allow them to ask another student for help or help them work through the problem aloud. Confirm or provide the correct answer: Fatima has 13 flowers in all.

3.TEACHER SAY: We are going to solve a few more of these in your student book. Please take out your book and turn to the page Lesson 15: Apply. On this page, you will see some story problems. We will read through each story problem together. You can use any of the mental math strategies on our poster to help you find the sum. Try not to draw pictures or use tally marks. After you solve the problem using mental math, write each number sentence in your student book.

TEACHER DO: For each story problem, read the problem aloud and then allow time for students to work independently to solve the problems. Walk around while students are working to help those who may need it. Then have students share their work and strategies with their Shoulder Partners and ask volunteers to share their work with the class. Be sure students explain their thinking and their use of the mental math strategy they selected. Confirm correct answers and encourage students
to fix their work if necessary.

STUDENTS DO: Listen to each story problem read by the teacher. Work independently to solve each problem using any of the mental math strategies. Record the number sentence in the student book. Share work and strategies with Shoulder Partner. Selected students share their work with the class. Correct the work in their student books if necessary.

Note to the Teacher: If students are unable to finish during class, consider having them complete the story problems for homework. Remind them they should be using mental math strategies rather than pictures or tally marks.

TEACHER SAY: Great work today, class. You all are getting very good at using mental math strategies to find the sum.