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Abacus Math >> Abacus Formulas >> Addition Formulas >>

# Abacus Addition Formulas

## Big Friend Add Order

NumberFormula Big Friend s
(+ 1) Add One
+ 1 = - 9 + 10
Big Friend of '1' is '9'
(+ 2) Add Two
+ 2 = - 8 + 10
Big Friend of '2' is '8'
(+ 3)  Add Three
+ 3 = - 7 + 10 Big Friend of '3' is '7'
(+ 4)  Add Four
+ 4 = - 6 + 10 Big Friend of '4' is '6'
(+ 5) Add Five
+ 5 = - 5 + 10
Big Friend of '5' is '5'
(+ 6)  Add Six
+ 6 = - 4 + 10 Big Friend of '6' is '4'
(+ 7)  Add Seven
+ 7 = - 3 + 10 Big Friend of '7' is '3'
(+ 8) Add Eight
+ 8 = - 9 + 10 Big Friend of '8' is '2'
(+ 9)  Add Nine
+ 9 = - 1 + 10 Big Friend of '9' is '1'

## Small Friend Add Order

Number Formulas Small Friend s
(+ 1) Add One
+ 1 = + 5 - 4 Small Friend of '1' is '4'
(+ 2)  Add Two
+ 2 = + 5 - 3  Small Friend of '2' is '3'
(+ 3)  Add Three
+ 3 = + 5 - 2 Small Friend of '3' is '2'
(+ 4)  Add Four
+ 4 = + 5 - 1 Small Friend of '4' is '1'

## Combination Add Order

NumbersFormulas 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'