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Grade 4 Number Sentences Overview

Mar 3, 2025

Number Sentence Lesson - Grade 4 Mathematics

Overview

This lesson, presented by Teacher Ika, focuses on number sentences as part of the Grade 4 Mathematics curriculum. The objective is to understand number properties, equivalent number facts, and properties of operations such as addition and multiplication.

Key Competencies and Objectives

  • Complete a Number Sentence
    • Commutative Property of Addition: Example 4 + 3 = 3 + _ (Answer: 3)
    • Equivalent Number Facts: Example 4 + _ = 6 + 3 (Answer: 2)

Day 1: Review and Activity

  • Review Basic Operations
    • Addition: 8 + 5 = 13, 12 + 9 = 21
    • Subtraction: 15 - 7 = 8, 30 - 12 = 18
    • Multiplication: 6 * 4 = 24, 9 * 7 = 63
    • Division: 24 / 6 = 4, 45 / 9 = 5

Activity 1: Pick and Match

  • Objective: Complete number sentences to represent number properties and number facts.
  • Examples:
    1. 3 + 7 + 4 = 10 + 4 (Answer: 14)
    2. 1 + 9 + 3 = 10 + 3 (Answer: 13)
    3. 2 + 8 + 9 = 10 + 9 (Answer: 19)

Day 2: Equivalent Number Facts

  • Definition: Number sentences with identical outcomes regardless of the arrangement.
  • Examples:
    1. 9 + 3 = 7 + 5
    2. 27 - 12 = 30 - 15

Day 3 & 4: Properties of Addition and Multiplication

  • Properties:
    • Commutative Property
      • Addition: Changing order does not change the sum (e.g., 4 + 5 = 5 + 4)
      • Multiplication: Changing order does not change the product (e.g., 3 * 7 = 7 * 3)
    • Associative Property
      • Addition: Changing grouping does not change the sum (e.g., (2 + 3) + 4 = 2 + (3 + 4))
      • Multiplication: Changing grouping does not change the product (e.g., (5 * 2) * 4 = 5 * (2 * 4))

Worked Examples

  • Fill in the Blanks:
    1. 13 + 19 = 13 + 19
    2. 5 * (3 * 4) = (5 * 3) * 4

Lesson Activity

  • Find the value of n:
    1. n + 12 = 32 (Answer: n = 20)
    2. 2 * (3 * n) = 18 (Answer: n = 3)

Learner's Takeaway

  • Properties of Addition and Multiplication
  • Representing Equivalent Number Facts
  • Encouragement for Self-discovery and Improvement

Formative Assessment

  • Students are encouraged to reflect and improve upon their mathematical skills.

Full transcript