0 + 1 =

1 + 0 =

1 – 0 =

1 – 1 =

0 + 2 =

1 + 1 =

2 + 0 =

2 – 0 =

2 – 1 =

2 – 2 =

0 + 3 =

1 + 2 =

2 + 1 =

3 + 0 =

3 – 0 =

3 – 1 =

3 – 2 =

3 – 3 =