Abacus Subtraction Formulas
Big Friend Less Order Formulas
| Numbers | Formulas | Big Friends |
|---|---|---|
| (- 1) Less One | - 1 = - 10 + 9 | Big Friend of '1' is '9' |
| (- 2) Less Two | - 2 = - 10 + 8 | Big Friend of '2' is '8' |
| (- 3) Less Three | - 3 = - 10 + 7 | Big Friend of '3' is '7' |
| (- 4) Less Four | - 4 = - 10 + 6 | Big Friend of '4' is '6' |
| (- 5) Less Five | - 5 = - 10 + 5 | Big Friend of '5' is '5' |
| (- 6) Less Six | - 6 = - 10 + 4 | Big Friend of '6' is '4' |
| (- 7) Less Seven | - 7 = - 10 + 3 | Big Friend of '7' is '3' |
| (- 8) Less Eight | - 8 = - 10 + 2 | Big Friend of '8' is '2' |
| (- 9) Less Nine | - 9 = - 10 + 1 | Big Friend of '9' is '1' |
Small Friend Less Order Formulas
| Numbers | Formulas | Small Friends |
|---|---|---|
| (- 1) Less One | - 1 = + 4 - 5 | Small Friend of '1' is '4' |
| (- 2) Less Two | - 2 = + 3 - 5 | Small Friend of '2' is '3' |
| (- 3) Less Three | - 3 = + 2 - 5 | Small Friend of '3' is '2' |
| (- 4) Less Four | - 4 = + 1 - 5 | Small Friend of '4' is '1' |
Combination Less Order Formulas
| Numbers | Formulas | Combination Friends |
|---|---|---|
| (- 6) Less Six | - 6 = - 10 + 5 - 1 | Comb. Friend of '6 is '1' |
| (- 7) Less Seven | - 7 = - 10 + 5 - 2 | Comb. Friend of '7' is '2' |
| (- 8) Less Eight | - 8 = - 10 + 5 - 3 | Comb. Friend of '8' is '3' |
| (- 9) Less Nine | - 9 = - 10 + 5 - 4 | Comb. Friend of '9' is '4' |