1. What are complementary numbers with respect to 10? 
2. How do complementary numbers relate to an abacus? 
3. How can I identify complementary numbers on an abacus? 
4. Can complementary numbers be used for multiplication on an abacus? 
5. Are complementary numbers only applicable to the abacus? 
Abacus Lesson 22 // Addition Complementary Numbers Respect to 10 ONE'S Column Video  08:05 min 
Abacus Lesson 23 // Addition Complementary Numbers Respect to 10 TEN'S Column Video  11:47 min 
Abacus Lesson 25 // SubtractionComplementary Numbers Respect to 10 ONE'S Column Video  05:44 min 
Abacus Lesson 24 // Addition Complementary Numbers Respect to 10 HUNDRED'S Column Video  10:53 min 
Abacus Lesson 26 // SubtractionComplementary Numbers Respect to 10 TEN'S Column Video  07:45 min 

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