Abacus Maths
Towards Better & Brighter Future

Addition Formulas

Abacus Addition Formulas

Abacus Addition Formulas

Big Friend Add Order

 Number Formula  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

 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'