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You are in : Home Room : Units : PD-ROM 1.1 : Math Content Strand : Ms. Barney's Lesson : Ms. Ogan's Lesson : Verifying Proporti...
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Math Content Strand

Verifying Proportions

Ms. Ogans Student PhotoOne of Ms. Ogan's students thinks 2/3 is the same as 8/12. Can he prove it? Let's watch as Ms. Ogan puts him in the hot seat.





Video Case Study Activity

Video Case Study Activity Verifying Proportions (5.5 minutes)
Lisa Ogan: Ogan 02

She provides three different approaches:

  1. Divide numerator and denominator by 4 to reduce the fraction 8/12 to 2/3.
  2. Use cross multiplication to obtain (2)(12) = (3)(8), which is indeed true (24 = 24).
  3. Multiply both sides of the equation 2/3 = 8/12 by 3. The multiplier 3 was chosen because 3 is the greatest common factor of 3 and 12.

Assessment Activity

Assessment 6: Verifying Proportions


Question:

Verify that 12/15 = 28/35 is a valid proportion by reducing the fractions to lowest terms.

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Question:

Verify that 12/15 = 28/35 is a valid proportion by using cross multiplication.

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Question:

Verify that 12/15 = 28/35 is a valid proportion by first dividing both denominators by the greatest common factor of the two denominators.

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