APRENDER A RESTARAPRENDER A RESTAR

1-1=01-1=0 2-1=12-1=1 1+1=21+1=2

APRENDER A RESTARAPRENDER A RESTAR

2-0=22-0=2 2-1=12-1=1 2-2=02-2=0

APRENDER A RESTARAPRENDER A RESTAR

3-1=23-1=2 3-2=13-2=1 3-3=03-3=0

APRENDER A RESTARAPRENDER A RESTAR

4-3=14-3=1 4-2=24-2=2 4-1=34-1=3