SUMA DE UNIDADES EN EL ÁBACO JAPONÉS

Front

3, 5, -6

Back

2

Front

2 + 7 - 5

Back

4

Front

1, 5, 3

Back

9

Front

5 + 4 - 2

Back

7

Front

15, 3, -2

Back

16

Front

9 - 4 + 2 + 1

Back

8

Front

3, 1, 5, -3

Back

6

Front

4 + 5 - 3

Back

6

Front

9 - 4 + 2 + 1

Back

8

Front

1, 3, 5, -4

Back

5