can you multiply these numbers mentally?
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Can you multiply these numbers mentally?. x ( x 14). How can you make a multiplication problem easier?. In this lesson you will learn to rewrite multiplication problems with rational numbers by using the associative property of multiplication. Order of Operations Grouping Symbols - PowerPoint PPT PresentationTRANSCRIPT
Can you multiply these numbers mentally?
x ( x 14)
How can you make a multiplication problem easier?
In this lesson you will learn to rewrite multiplication problems with rational numbers by using
the associative property of multiplication.
Let’s ReviewLet’s Review
Order of Operations1. Grouping Symbols2. Exponents3. Multiplication/Division worked left to
right4. Add/Subtract worked left to right
Let’s ReviewLet’s Review
Associative Property of multiplication3 x 4 x 5 =
12 x 5 =3 x 4 x 53 x 20
60 = 60(a x b) x c = a x (b x c)
Let’s ReviewA Common Mistake
Order of Operations
(3 + 4) x 5 = 3 + (4 x 5)35 ≠ 60
Let’s ReviewCore Lesson
x ( x 14) =
( x ) x 14 =1
11
2 x 14 = 7
Let’s ReviewCore Lesson
x (- x 25) =
( x -) x 25 =1
11
4 x -25 = - = -6 = -6.25
In this lesson you have learned to rewrite multiplication problems with rational numbers by using the associative property of
multiplication.
Let’s ReviewGuided Practice
Rewrite the multiplication the problem using the associative property and then solve:
- x ( x 10) =
(- x ) x 10 = 5
Let’s ReviewExtension Activities
Rewrite the multiplication using the associative property and solve:
(24 ÷ ) ÷ x x x
Let’s ReviewQuick Quiz
Rewrite the multiplication the problem using the associative property and then solve:
- x ( x 12) = (-20 x ) x =