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Wednesday, April 7, 2021

Use reversibility

 Hi there this week we learned reversibility.  I have shown this in the slideshow below. 


 Can  you solve this example  like this  27-21=?






1 comment:

  1. Hello Ayman L.
    I loved your reversibility your so smart at math. can you teach me your question is so hard to answer. Enjoy your week.

    Mark H.

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