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Two-Digit Addition Without Regrouping Lesson Plan

Lesson Plan
Grade 2
English

Two-Digit Addition Without Regrouping Lesson Plan

Lesson Overview

This lesson focuses on developing fluency in adding two-digit numbers within 100 without regrouping. Students will use place value strategies to add tens to tens and ones to ones, reinforcing the concept that in addition, digits in the same place value are combined.
Grade Level: Grade 2 Duration: 45 Minutes Standard: CCSS.MATH.CONTENT.2.NBT.B.5 — Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.

Learning Objectives

  • Students will be able to add two-digit numbers without regrouping using the vertical method.
  • Students will identify and align digits in the tens and ones places correctly.
  • Students will understand that the sum is the result of combining tens and ones separately when no carrying is required.

Materials Needed

  • Base-ten blocks (tens rods and ones cubes)
  • Whiteboards and markers
  • "Two-Digit Addition: Place Value Practice" Worksheet (included below)


Lesson Procedure

1. Introduction & Hook (5 minutes)

  • The Problem: Present a real-world scenario: "I have 12 red apples and 15 green apples. How many do I have in all?"
  • Brainstorm: Ask students how they might solve this. Encourage strategies like drawing pictures or using base-ten blocks.
  • Objective: Explain that today we will learn a "shortcut" way to add large numbers by looking at their tens and ones.

2. Direct Instruction (15 minutes)

  • Modeling: Write the problem vertically on the board:
    
    .
  • Place Value Alignment: Show students how to align the tens (1 and 1) and the ones (2 and 5). Use a vertical line to separate the places if helpful.
  • The Rule: "Always start in the ones place!"
  • Step 1: Add the ones:
    
    . Write 7 in the ones place.
  • Step 2: Add the tens:
    
    . Write 2 in the tens place.
  • Visual Support: Use base-ten blocks to show 12 (1 rod, 2 cubes) and 15 (1 rod, 5 cubes). Combine them to see 2 rods and 7 cubes (27).
  • Check for Understanding: Model another problem like
    
    . Ask students: "Where do I start?" (Ones). "What is
    
    ?" (6). "What is
    
    ?" (5).

3. Guided Practice (10 minutes)

  • Whiteboard Practice: Have students solve 3 problems on their individual whiteboards:
  1. 
  1. 
  1. 
  • Correcting Misconceptions: Circulate to ensure students are aligning numbers correctly and not adding across places (e.g., adding a tens digit to a ones digit).

4. Independent Practice (15 minutes)

  • Students will complete the "Two-Digit Addition: Mastery Practice" worksheet.
  • Instructions: Remind students to start with the ones column for every problem. The first row has place-value headers to help them stay organized.


Two-Digit Addition: Mastery Practice

Name:
Date:
Two-Digit Addition (No Regrouping)Standard: CCSS.MATH.CONTENT.2.NBT.B.5
TO
1 1+ 1 2
TO
2 0+ 1 5
TO
1 4+ 1 4
TO
3 1+ 0 6
TO
2 2+ 1 5
2 5+ 2 3
4 1+ 1 8
3 3+ 3 3
1 6+ 5 2
4 4+ 2 5
3 0+ 4 9
5 2+ 2 7
4 1+ 4 8
6 5+ 1 4
2 6+ 5 3
7 2+ 1 7
3 4+ 5 5
1 5+ 8 4
6 2+ 3 6
4 7+ 5 1
8 1+ 1 8
2 3+ 7 6
4 5+ 5 4
3 8+ 6 1
5 7+ 4 2


5. Evaluation & Closure (5 minutes)

  • Exit Ticket: Write the problem
    
    on the board. Have students solve it on a sticky note before leaving.
  • Review: Remind students that when we don't need to regroup, adding is as simple as combining the 'friends' in the same house (place value column).