Arithmetic properties: Associative property

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Intros
Lessons
  1. Introduction to the associative property of addition and multiplication:
  2. Showing that (a+b)+c=a+(b+c)(a + b) + c = a + (b + c)
  3. Why is it called the "associative" property?
  4. Addition shortcuts using the associative property
  5. Showing that (a × b) × c = a × (b × c)
  6. Multiplication shortcuts using the associative property
  7. The general formulas for the associative property
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Examples
Lessons
  1. Associative Property Equations
    Use the associative property (for addition and multiplication) to fill in the blanks.
    1. (7 + 2) + 8 = 7 + (2 + __)
    2. 14×(16×15)=(14×\large \frac{1}{4} \, \times \, (\frac{1}{6} \, \times \, \frac{1}{5}) = (\frac{1}{4} \, \times \, ______ )×15\large ) \, \times \, \frac{1}{5}
    3. (xx + 3 + 8) + __ = (3 + 9 + x) + 8
  2. Changing the grouping to add lists of numbers
    Decide how to group the addends as a shortcut for addition. Double check your answer by adding without groups.
    1. 0.1 + 0.6 + 0.9 + 0.4 =
    2. 210+310+110+410+910+710+610+810=\large \frac{2}{10} + \frac{3}{10} + \frac{1}{10} + \frac{4}{10} + \frac{9}{10} + \frac{7}{10} + \frac{6}{10} + \frac{8}{10} =
    3. 23+59+13+49+67=\large \frac{2}{3} + \frac{5}{9} + \frac{1}{3} + \frac{4}{9} + \frac{6}{7} =
  3. Changing the grouping to multiply lists of numbers
    Decide how to group the factors as a shortcut for multiplication. Double check your answer by multiplying without groups.
    1. 20 × 15 × 5
    2. 0.8 × 0.9 × 0.5
    3. 6 × 20 × 5 × 2
  4. Associative property of addition word problem
    Ryan added these numbers together and his answer is correct. Show another way of adding numbers (with grouping) using the associative property!

    Associative Property
    1. Associative property of multiplication word problem
      Explain which choice is NOT an equal statement to: (6 × 8) × 5
      1. 6 × 40
      2. 48 × 5
      3. 6 × (8 × 5)
      4. 14 × 5
      1. Associative property and volume
        The formula for the volume of a rectangular prism is given by:

        Volume = length × width × height


        Use the associative property of multiplication to show 2 ways to solve for this prism.
        Associative Property
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        Practice
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        Topic Notes
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        In this lesson, we will learn:

        • What is the commutative property of addition?
        • What is the commutative property of multiplication?
        • How to write the general formulas/equations for the commutative properties
        • Changing the order of a list of addends/factors does not change the answer
        • How to solve word problems for the commutative property

        Notes:

        • The associative property means that changing the grouping of numbers in an equation does NOT change the answer when you are performing ONLY addition or ONLY multiplication
          • The numbers can be any real number (whole numbers, fractions, decimals, integers, etc.)
          • To “associate” can mean to interact with a group of people/friends or to group together.
          • No matter how you want to group (using brackets) the numbers in an addition or multiplication equation, it will not change the answer in the end.

        • For addition: the grouping of addends does not change the answer
          • Ex. (1 + 2) + 3 = 1 + (2 + 3) will equal 6 either way
            • Because (1 + 2) + 3 = (3) + 3 = 6
            • As well, 1 + (2 + 3) = 1 + (5) = 6

        • The associative property for addition can make shortcuts for adding whole numbers and decimals by making sums of 10 (i.e. 1 + 9, 2 + 8, 3 + 7, 4 + 6, and 5 + 5)
          • Ex. 8 + 6 + 2 + 4 + 5 + xx
            • Group as: (8 + 2) + (6 + 4) + 5 + x = (10) + (10) + 5 + xx = 25xx
          • Ex. 0.9 + 0.7 + 0.3 + 0.1
            • Group as: (0.9 + 0.1) + (0.7 + 0.3) = (1.0) + (1.0) = 2.0

        • Shortcuts for adding fractions is also possible with the associative property by making wholes (i.e. same numerator and denominator; 44,22,1010\large \frac{4}{4}, \frac{2}{2},\frac{10}{10})
          • Ex. 34+24+14\large \frac{3}{4} + \frac{2}{4} + \frac{1}{4}
            • Group as: (34+14)+24=44+24=1+24=124\large (\frac{3}{4} + \frac{1}{4}) + \frac{2} {4} = \frac{4} {4} + \frac{2} {4} = 1 + \frac{2} {4} = 1 \frac{2}{4}
          • Ex. 29+25+79+35+14\large \frac{2}{9} + \frac{2}{5} + \frac{7}{9} + \frac{3}{5} + \frac{1}{4}
            • Group as: (29+79)+(25+35)+14=(99)+(55)+14=1+1+14=214\large (\frac{2}{9} + \frac{7}{9}) + (\frac{2} {5} + \frac{3} {5}) + \frac{1} {4} = (\frac{9} {9}) + (\frac{5}{5}) + \frac{1}{4} = 1 + 1 + \frac{1}{4} = 2 \frac{1}{4}

        • For multiplication: the grouping of factors does not change the answer
          • Ex. (2 × 3) × 4 = 2 × (3 × 4) will equal 24 either way
            • Because (2 × 3) × 4 = (6) × 4 = 24
            • As well, 2 × (3 × 4) = 2 × (12) = 24

        • The associative property for multiplication can make shortcuts for multiplying any real numbers by making multiples of 10 (i.e. 10, 20, 30, 40…)
          • Ex. 2 × 8 × 5 × ee
            • Group as: (2 × 5) × 8 × ee = (10) × 8 × ee = 80 × ee = 80ee
          • Ex. 0.9 × 0.5 × 0.6
            • Group as: (0.5 × 0.6) × 0.9 = (0.30) × 0.9 = 0.270
          • Ex. 52\large \frac{5}{2} × 913\frac{9}{13} × 450\frac{4}{50}
            • Group as: 5x9x42x13x50\large \frac{5 \, x \, 9 \, x \, 4}{2 \, x \, 13 \, x \, 50} = (5x4)x9(2x50)x13\large \frac{(5 \, x \, 4) \, x \, 9}{(2 \, x \, 50) \, x \, 13} = (20)x9(100)x13=1801300\large \frac{(20) \, x \, 9 }{(100) \, x \, 13 } = \frac{180}{1300}

        • The general formulas (where aa, bb and cc are variables that represent real numbers) for the associative property are:

        Arithmetic Property

        Of Addition

        Of Multiplication

        Associative Property

        (a+b)+c=a+(b+c)(a + b) + c = a + (b + c)

        (a×b)×c=a×(b×c) (a × b) × c = a × (b × c)