CHRONO

30 s.

Additions à trous (a + b + ? = s <= 20).

CHRONO

0 s.
9 + 1 + = 13
5 + 1 + = 15
6 + 8 + = 17
3 + 8 + = 19
5 + 6 + = 17
7 + 7 + = 19
4 + 5 + = 14
3 + 3 + = 10
4 + 5 + = 12
1 + 3 + = 12
4 + 8 + = 19
6 + 3 + = 17
4 + 4 + = 13
1 + 5 + = 12
3 + 8 + = 12
4 + 6 + = 15
5 + 2 + = 13
3 + 8 + = 17
3 + 3 + = 9
7 + 4 + = 16