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What to createLesson plan
Which subjectMathematics
What topicadd and subtract within 100
What length (min)30
What age groupYear or Grade 2
Include homework
Include images descriptions
Any other preferencesGrr model ...Skip to main content IM Curriculum About Us Contact Us Invite a User Lesson 12345678910111213141516 Lesson 9 Add and Subtract Within 100 PreparationLesson Warm-up: Which One Doesn’t Belong: Tens and Ones (10 minutes) CCSS Standards Building Towards 2.NBT.B.5 Routines and Access Instructional Routines Which One Doesn’t Belong? Narrative This warm-up prompts students to carefully analyze and compare features of base-ten diagrams. In making comparisons, students look for and make sue of structure as they describe representations of tens, ones, and the value of the base-ten diagrams (MP7). It gives the teacher an opportunity to hear how students use terminology and talk about characteristics of base-ten diagrams, including equivalent representations (MP6). This will be important as students compose and decompose two-digit numbers as they add and subtract within 100. Launch Groups of 2 Display the image. “Pick one that doesn’t belong. Be ready to share why it doesn’t

Lesson Plan: Add and Subtract Within 100

Grade Level: 2
Subject: Mathematics
Duration: 30 minutes

CCSS Standards

Preparation

Section 1: Lesson Warm-up: Which One Doesn’t Belong (10 minutes)

Objective:
To encourage students to analyze and compare features of base-ten diagrams, enhancing their understanding of tens and ones.

Narrative

In this warm-up activity, students will carefully analyze groups of base-ten diagrams and determine which one does not belong. This prompts them to describe their reasoning, using mathematical terminology about the characteristics of tens and ones. Engaging in this type of discussion helps prepare students for composing and decomposing two-digit numbers as they add and subtract within 100.

Launch

The image of four base-ten blocks arranged in sets of tens and ones — one set shows 30 (three tens), the other shows 42 (four tens and two ones), the third shows 25 (two tens and five ones), and the last shows 50 (five tens).

Section 2: Direct Instruction (10 minutes)

Objective:
To introduce and explain the concepts of addition and subtraction within 100.

Lesson Content

  1. Introduction to Addition and Subtraction: Explain that students will be adding and subtracting numbers within 100.
  2. Place Value Overview: Review the concepts of tens and ones with students, perhaps using a place value chart. Highlight how numbers can be decomposed.

The image of a colorful place value chart displaying numbers with columns for 'Tens' and 'Ones'. The chart should feature examples of numbers up to 100, showing how to break down each number into its place value components.

  1. Using Base-Ten Blocks: Introduce base-ten blocks as manipulatives for addition and subtraction. Show how to represent numbers using these blocks.

Section 3: Guided Practice (5 minutes)

Activity: Solving Problems Together

  1. Present a problem on the board, such as 47 + 25.
  2. Ask students to represent the numbers using base-ten blocks.
  3. Guide students through the addition process and discuss any challenges.

The image of base-ten blocks arranged to solve the math problem 47 + 25, demonstrating the addition process visually with clear labels.

Section 4: Independent Practice (5 minutes)

Activity: Worksheets

  1. Hand out worksheets with a variety of addition and subtraction problems within 100.
  2. Encourage students to use the strategies discussed while completing their worksheets.

The image of a worksheet designed for Grade 2 students, featuring addition and subtraction problems within 100, with spaces for students to show their work using base-ten blocks.

Section 5: Closing and Reflection (5 minutes)

Discussion

  1. Have students share their strategies for solving problems.
  2. Ask questions to reinforce understanding, such as, “How can we break down a number when adding?”

Exit Ticket

Provide an exit ticket with one addition and one subtraction problem for each student to complete as they leave.

The image of an exit ticket template for students, with one space for addition and one for subtraction, labeled ‘Please show your work!’

Conclusion

This lesson aims to enhance students' skills in adding and subtracting numbers within 100 by using hands-on materials and collaborative learning methods. Encourage students to continue practicing with base-ten blocks and place value concepts in future lessons.