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2.18 Using equivalence to calculate


Created on 13 August 2019 by ncetm_administrator
Updated on 13 August 2019 by ncetm_administrator

Introduction

Develop efficiency in calculation by using equivalence, through adjusting the factors (in multiplication) and the dividend and divisor (in division).

Teaching points

  • Teaching point 1: For multiplication, if there is a multiplicative increase to one factor and a corresponding decrease to the other factor, the product stays the same.
     
  • Teaching point 2: For division, if there is a multiplicative change to the dividend and a corresponding change to the divisor, the quotient stays the same.
     

 
 

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