Mathematics
Grade 6
15 min
Properties of multiplication
Properties of multiplication
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1
Introduction & Learning Objectives
Learning Objectives
Identify the Commutative Property of Multiplication.
Identify the Associative Property of Multiplication.
Identify the Distributive Property.
Apply the Commutative and Associative Properties to simplify numerical expressions.
Use the Distributive Property to solve multiplication problems more efficiently.
Recognize the Identity and Zero Properties of Multiplication.
Explain how properties of multiplication can make calculations easier.
Ever wonder if changing the order of numbers when you multiply makes a difference? 🤔 Or if there's a clever trick to multiply big numbers easily?
In this lesson, you'll discover special rules, called properties, that make multiplication easier and more flexible. Understanding these properties will help you si...
2
Key Concepts & Vocabulary
TermDefinitionExample
PropertyA fundamental rule or truth that applies to numbers and operations, always remaining consistent.The Commutative Property is a rule that tells us we can change the order of numbers when multiplying.
Commutative Property of MultiplicationThis property states that changing the order of the factors does not change the product.$3 \times 5 = 15$ and $5 \times 3 = 15$. The product is the same.
Associative Property of MultiplicationThis property states that changing the grouping of factors does not change the product.$(2 \times 3) \times 4 = 6 \times 4 = 24$ and $2 \times (3 \times 4) = 2 \times 12 = 24$. The product is the same.
Distributive PropertyThis property states that multiplying a number by a sum (or difference) is the same as multiplying the number by each...
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Core Formulas
Commutative Property of Multiplication
$a \times b = b \times a$
Use this property when you want to change the order of numbers in a multiplication problem to make it easier to calculate or to show that order doesn't matter.
Associative Property of Multiplication
$(a \times b) \times c = a \times (b \times c)$
Use this property when you have three or more numbers being multiplied and you want to change how they are grouped to simplify the calculation, often by creating easier products first.
Distributive Property
$a \times (b + c) = (a \times b) + (a \times c)$
Use this property to multiply a number by a sum (or difference) by breaking down one of the factors. It's very useful for mental math or simplifying expressions with variables.
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Challenging
Which sequence of properties correctly justifies simplifying 5 × (17 × 20) to 1700?
A.First Distributive, then Commutative.
B.First Associative, then Identity.
C.First Commutative, then Associative.
D.Only the Associative Property is needed.
Challenging
A student claims that (20 - 10) - 3 is equal to 20 - (10 - 3) because of the Associative Property. Why is the student incorrect?
A.The Associative Property does not apply to subtraction.
B.The student should have used the Commutative Property.
C.The student did not distribute the numbers correctly.
D.The numbers are too large for the Associative Property.
Challenging
The equation (a × 5) × b = a × (b × 5) is always true for any numbers a and b. This is a direct result of applying which two properties in sequence?
A.Distributive and Identity
B.Associative and Commutative
C.Identity and Zero
D.Commutative and Distributive
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