Reply To: Week 4 Video Lessons

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#30348
Fabio Zanatta
Participant

Hello,

in lesson “multiplying near base 100”, if we consider the multiplication 89×97=8633

89 is deficient from 100 of 11

97 is deficient from 100 of 3

The first part of the result is 89-3=86 (3 is the deficiency of 97 form 100)

The second part of the resutl is 11×3=33

 

I observed that we can calculate 86 in other ways:

  • if we consider deficiency of both numbers (97 and 89) we have: 100-11-3=86
  • if we consider 97 and the deficiency of 89 we have: 97-11=86

It’s correct?

Thanks

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