Abacus Lesson 9 // Addition Complementary Numbers Respect to 5 ONE'S Column Video  10:46 min 
Abacus Lesson 8 // Simple Addition (#'s 010) HUNDREDS'S column // Step by Step // Tutorial Video  07:10 min 
Abacus Lesson 10 // Addition Complementary Numbers Respect to 5 TEN'S Column Video  06:58 min 
Abacus Lesson 11 // Addition Complementary Numbers Respect to 5 HUNDREDS'S Column Video  05:40 min 
Abacus Lesson 13 // Simple Subraction (#'s 05 only) TEN'S column // Step by Step // Tutorial Video  03:50 min 

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