Year 3
Year 3
Using commutativity and associativity to multiply
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Lesson details
Key learning points
- In this lesson, we will explore the laws of multiplication, and use known facts and the laws of commutativity and associativity to perform efficient multiplication.
Licence
This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.
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5 Questions
Q1.
I scored 13, 15 and double 9 on the dart board. What is my total?
37
55
Q2.
I scored 11, triple 6 and double 8 on the dart board. What is my total?
39
51
Q3.
I scored double 2, triple 10 and a bullseye. What is my total?
39
88
Q4.
I have 300 points. I have just deducted 87 points. How many points do I have left?
113
203
Q5.
I have 201 points. I have just deducted 93 points. How many points do I have left?
107
109
5 Questions
Q1.
What is the commutative law in multiplication?
If you change the order of factors and the product will change too.
Q2.
What is the associative law in multiplication?
You can multiply three factors in a certain order.
You should not multiply more than two factors.
Q3.
Which law do you use when multiplying 2 x 5 x 6?
commutative law
Q4.
When multiplying 6 x 2 x 5, which is the most efficient order?
Multiply 2 by 5 then multiply 10 by 6
Multiply 6 x 2 then multiply 12 by 5
Q5.
8 x 4 x 10 = 4 x 10 x 8. True or false?
False