MathIsimple
Unit 1: Two-Digit Operations

Two-Digit Operations

Master two-digit addition and subtraction with regrouping. Learn strategies for solving problems with numbers up to 100 through engaging, real-world scenarios.

4 Interactive LessonsReal-World ScenariosVisual Learning ToolsStep-by-Step Guidance
Learning Objectives

Addition Skills:

  • • Add two-digit numbers without regrouping
  • • Add two-digit numbers with regrouping
  • • Use break apart and stick model strategies
  • • Practice vertical addition with carrying

Subtraction Skills:

  • • Subtract two-digit numbers without regrouping
  • • Subtract two-digit numbers with regrouping
  • • Use number line and decompose strategies
  • • Practice vertical subtraction with borrowing

Lessons

Explore 4 comprehensive lessons covering all aspects of two-digit operations

Lesson 1-1: Two-Digit Addition Without Regrouping
25-30 min
Lesson 1
Learn to add two-digit numbers using the 'break apart' strategy. Practice with classroom library scenarios and visual number cards.

Real-World Scenario:

Classroom Library Corner: 23 story books + 15 science books = ?

Key Skills:

Break Apart Strategy
Tens and Ones Addition
Vertical Addition
Number Cards

Features:

  • Classroom library scenario
  • Interactive number cards
  • Break apart method
  • Visual regrouping tools
Lesson 1-2: Two-Digit Addition With Regrouping
30-35 min
Lesson 2
Master addition with regrouping using the 'stick model' to understand carrying. Practice marking the 'carry 1' in vertical addition.

Real-World Scenario:

Birthday Party Balloons: 18 red balloons + 25 blue balloons = ?

Key Skills:

Regrouping Strategy
Carrying
Stick Model
Vertical Addition

Features:

  • Birthday party balloon scenario
  • Interactive stick model
  • Carry 1 practice
  • Step-by-step guidance
Lesson 1-3: Two-Digit Subtraction Without Regrouping
25-30 min
Lesson 3
Learn subtraction using the 'number line' method. Compare vertical subtraction with number line results for better understanding.

Real-World Scenario:

Supermarket Fruit Stand: 46 apples - 23 sold = ?

Key Skills:

Number Line Method
Subtraction Strategy
Vertical Subtraction
Comparison

Features:

  • Supermarket fruit stand scenario
  • Interactive number line
  • Vertical subtraction practice
  • Method comparison
Lesson 1-4: Two-Digit Subtraction With Regrouping
30-35 min
Lesson 4
Master subtraction with regrouping using the 'decompose model'. Practice marking the 'borrow 1' in vertical subtraction.

Real-World Scenario:

Playground Jump Ropes: 32 jump ropes - 17 borrowed = ?

Key Skills:

Decompose Model
Borrowing
Regrouping
Vertical Subtraction

Features:

  • Playground jump rope scenario
  • Interactive decompose model
  • Borrow 1 practice
  • Visual regrouping tools

Learning Strategies

Master these essential strategies for two-digit operations

Break Apart

Split numbers into tens and ones: 23 + 15 = (20 + 10) + (3 + 5)

Stick Model

Use visual sticks to understand regrouping: 8 + 5 = 13, bundle 10

Number Line

Jump backwards on number line: 46 - 23 = jump 20, then 3

Decompose

Break apart for borrowing: 32 = 20 + 12, then 12 - 7 = 5

Ready to start learning?

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