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#abacuslevel3 #abacus10compliments #abacusbigfriends #bigfriendsaddition #bigfriendssubtraction
This video shows level 3 (Part 4) of the abacus training in which 10's compliments 3 digit addition and subtraction are explained. 10 compliments are also called big friends. Both +10 and -10 compliment based sums are shown.
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