3. Arithmétique. Table d'addition : 1

1 + 0 = 1

1 + 1 = 2

1 + 2 = 3

1 + 3 = 4

1 + 4 = 5

1 + 5 = 6 

1 + 6 = 7

1 + 7 = 8

1 + 8 = 9

1 + 9 = 10

1 + 10 = 11