Abacus all 34 formulas | Combination formula | Big friends| Small friends Abacus | Abacus for kids

Abacus Formula: Big Friend ,Combination & Small Friend Explained
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Numbers Formulas Combination Friends
(+ 6) Add Six + 6 = + 1 - 5 + 10 Comb. Friend of '6' is '1'
(+ 7) Add Seven + 7 = + 2 - 5 + 10 Comb. Friend of '7' is '2'
(+ 8) Add Eight + 8 = + 3 - 5 + 10 Comb. Friend of '8' is '3'
(+ 9) Add Nine + 9 = + 4 - 5 + 10 Comb. Friend of '9' is '4'
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