10
09876 54321

5432 1

2+2=

543 21

1+2=

5432 1

4+1=

0 5432 1

5-1=

0 5432 1

4-4=

543 21

3+0=

5432 1

1+1=

0 54321

5-5=

5432 1

3+1=

5432 1

1+4=

0 54321

2-2=

5432 1

2+1=

0 5432 1

0+3=

5432 1

3+2=

0 5432 1

0+4=

5432 1

1+3=

0 5432 1

0+2=

0 5432 1

1+0=

05432 1

2+0=

5432 1

2+3=

0 5432 1

0+5=

0 5432 1

4+0=

0 5432 1

0+1=

0 5432 1

5+0=

10
0987654 32111121314 15 1617181920

10
0987654 321111213 14 15