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3.9 Multiplying fractions and dividing fractions by a whole number


Created on 21 August 2019 by ncetm_administrator
Updated on 23 August 2019 by ncetm_administrator

Introduction

Explore how to multiply two fractions. Learn how to divide a fraction by a whole number by first converting to an equivalent multiplication. Review how multiplying by a proper fraction makes a number smaller.

Teaching points

  • Teaching point 1: When a fraction is multiplied by a proper fraction, it makes it smaller. To multiply two fractions, multiply the numerators and multiply the denominators.
     
  • Teaching point 2: When a fraction is divided by a whole number, it makes it smaller. To divide a fraction by a whole number, convert it to an equivalent multiplication.
     
  • Teaching point 3: A more efficient method can be used to divide a fraction by a whole number when the whole number is a factor of the numerator.
     

 
 

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