Lesson Plan: Represent and Solve Put Together/Take Apart with Addend Unknown Problems
Grade Level: 1
Subject: Mathematics
Duration: 30 minutes
Topic: Put Together/Take Apart with Addend Unknown Problems
Objectives
- Students will be able to represent addition problems using physical objects and drawings.
- Students will solve put together/take apart problems with unknown addends.
- Students will communicate mathematical thinking verbally and in writing.
Materials Needed
- Counting cubes or small manipulatives (e.g., buttons, beans)
- Whiteboard and markers
- Paper and crayons for drawing
- Worksheets with put together/take apart problems
- Story problems on cards for group activities
Standards
This lesson aligns with the following Common Core State Standards for Mathematics:
- CCSS.MATH.CONTENT.1.OA.A.1 - Use addition and subtraction within 20 to solve word problems.
- CCSS.MATH.CONTENT.1.OA.A.2 - Solve word problems that involve addition and subtraction.
Introduction (5 minutes)
- Gather the students in a circle and introduce the lesson topic: “Today, we are going to learn how to solve problems where we put things together or take things apart!”
- Ask the students: “Can anyone tell me what addition means?” (Allow for responses.)
- Briefly explain that addition is when we put things together and that sometimes we don’t know how many we have altogether or how many we started with.
Direct Instruction (10 minutes)
-
Model a Put Together Problem:
- On the whiteboard, draw a simple problem: “There are 3 apples, and then I add 2 more apples. How many apples do I have now?”
- Use counting cubes to demonstrate visually (3 cubes, then 2 more).
- Write the equation: (3 + 2 = ?) and solve the problem together.
-
Model a Take Apart Problem:
- Present a new problem on the board: “I have 5 balloons, and I give away 2. How many balloons do I have left?”
- Again, use manipulatives to visualize the problem.
- Write the equation: (5 - 2 = ?) and solve it collectively.
-
Introduce Unknown Addends:
- Write a problem: “I have some candies. I found 4 more candies. Now I have 10 candies. How many candies did I have at first?”
- Write the equation: (? + 4 = 10). Work through the problem as a class.
Guided Practice (10 minutes)
-
Group Activity:
- Divide the class into small groups and give each group a set of story problems on cards.
- Ask each group to solve the problems using manipulatives and to show their work by drawing it out on paper.
-
Support and Monitor:
- Walk around to assist where needed and encourage students to explain their thought process to their peers.
Independent Practice (5 minutes)
- Hand out worksheets that include a mix of put together and take apart problems with unknown addends.
- Allow students to work independently, encouraging them to draw pictures or use manipulatives to help solve the problems.
Closure (5 minutes)
- Ask a few students to share their answers with the class. Discuss different strategies they used to find the unknown addends.
- Reinforce the concept: “When we put things together or take them apart, we can use math to find out how many we have!”
- Collect worksheets for assessment.
Assessment
- Observe students during group activities for understanding and collaboration.
- Review completed worksheets for accuracy in solving put together/take apart problems with unknown addends.
Extensions
- Provide additional challenge problems for students who finish early or understand the material quickly.
- Introduce subtraction stories where they can create their own problems using the take apart concept.
Reflection
- After the lesson, consider what went well, what could be improved, and how students responded to the concept of unknown addends. Adjust future lessons based on this reflection.
This lesson plan is designed to engage Grade 1 students in understanding addition and subtraction through practical applications and collaborative learning!