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Multiplying Fractions

Multiplying Fractions. Grade 9 Applied Mathematics M. M. Couturier. Multiplying Fractions. If you know how to add and subtract fractions, then you already know how to multiply fractions!!!. Multiplying Fractions. Let us take the following example:

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Multiplying Fractions

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  1. Multiplying Fractions Grade 9 AppliedMathematics M. M. Couturier

  2. Multiplying Fractions • If you know how to add and subtract fractions, then you already know how to multiply fractions!!!

  3. Multiplying Fractions • Let us take the following example: • (2)(2) (3)(5) • The denominators are not the same; WHO CARES; this is multiplication!!!

  4. Multiplying Fractions • In multiplication, regardless of the numbers you simply multiply ALL the numerators and then you multiply ALL the denominators.

  5. Multiplying Fractions • Hence in the case of: • (2)(2) (3)(5) • The numerators are 2x2=4 and the denominators are 3x5=15; hence, • 4 15 • DONE!!! QED!!!

  6. Multiplying Fractions • Let’s do another example: • (2)(1) (3)(4) • 2 12 • In this case, we need only simplify the fraction: • 1 6

  7. THE BLUEPRINT • The following will work for ALL multiplications of proper fractions.

  8. THE BLUEPRINT • Let us recall our strand in algebra: • (a)(c) (b)(d) • ac bd • The ironic thing about multiplying fractions is that it is easier than addition and subtraction!!!

  9. WWW • Let us visit the world wide web: • http://www.aaamath.com/fra66m-multfract.html

  10. WWW • Let us visit the world wide web: • http://www.aaamath.com/B/fra66mx2.htm

  11. WWW • For those who are visual: • http://www.visualfractions.com/multiply.htm

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