Distributive_Property_1-10

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					Distributive Property


    Chapter 1
    Lesson 10
                 Objective
 Give the missing number in expressions
  rewritten using the Distributive Property, and
  use that property to compute mentally.
                   Warm Up
 Tell which property is shown.


1. 47 + 68 = 68 + 47
2. 568 = 568 x 1
3. (39 x 5) x 6 = 39 x (5 x 6)
                 Key Idea
 You can use the Distributive Property to
  compute products mentally.
                Vocabulary
 Distributive Property: Multiplying a sum by a
  number produces the same result as
  multiplying each addend by the number and
  adding the products.
  Example: 2 x (3 + 4) = (2 x 3) + (2 x 4)
 Break apart: Using the Distributive Property to
  compute mentally.
                Example A
Find 47 x 6 using mental math
 Break apart 47
   (40 + 7)6
 Use the Distributive Property.
   40(6) + 7(6)
   240 + 42
   282
                Example B
Find (9)45 + (9)5 using mental math.
 Each product has a 9 as one of its factors.
 Use the Distributive Property.
  9(45 + 5)
  9(50)
  450

				
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posted:9/20/2011
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