Associative Property for Multiplication


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Definition of the Associative Property for Multiplication

  1. Basic Concept: The Associative Property for Multiplication states that when multiplying three or more numbers together, the way the numbers are grouped does not change the product (result of multiplication).
  2. Mathematical Expression:
    • (a×b)×c=a×(b×c)
    • Regardless of how the numbers are grouped with parentheses, the product remains the same.

Examples in Mathematics

  • Example 1:
    • Calculate (2×3)×4 and 2×(3×4).
    • (2×3)×4=6×4=24
    • 2×(3×4)=2×12=24
    • Both ways give the same result: 24.
  • Example 2:
    • Calculate (5×2)×6 and 5×(2×6).
    • (5×2)×6=10×6=60
    • 5×(2×6)=5×12=60
    • The product is the same: 60.

Real-Life Examples

Example 1: Cooking in Bulk

  • Scenario: A recipe calls for 3 eggs and serves 2 people. You want to prepare it for 6 people.
  • Calculation: Multiply 3 eggs by 2 (for the original recipe) and then by 3 (for the three sets of 2 people), or group it as 3 eggs multiplied by (2 people times 3 sets).
  • Associative Property:
    • (3×2)×3=6×3=18 eggs
    • 3×(2×3)=3×6=18 eggs
  • Result: You need 18 eggs regardless of the grouping.

Example 2: Construction Material

  • Scenario: You’re buying bricks for a project. Each row needs 4 bricks, and you plan to stack 5 rows on 3 different walls.
  • Calculation: Multiply 4 bricks by 5 rows and then by 3 walls, or group it as 4 bricks multiplied by (5 rows times 3 walls).
  • Associative Property:
    • (4×5)×3=20×3=60 bricks
    • 4×(5×3)=4×15=60 bricks
  • Result: You’ll need 60 bricks in total.

Key Takeaways

  • The Associative Property for Multiplication allows flexibility in grouping numbers without affecting the outcome.
  • This property can simplify calculations by allowing you to multiply in the order that is easiest, especially with larger numbers or when doing mental math.
  • In practical situations, such as cooking or construction, this property helps in scaling up measurements or quantities efficiently.

Understanding the Associative Property for Multiplication is not only useful in mathematics but also in everyday problem-solving, making complex calculations more manageable.


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