CHRONO

2 s.

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

CHRONO

0 s.
6 + 5 + = 12
1 + 5 + = 9
8 + 6 + = 20
9 + 7 + = 20
5 + 4 + = 11
5 + 7 + = 13
2 + 5 + = 8
6 + 9 + = 18
1 + 2 + = 10
4 + 6 + = 13
1 + 1 + = 9
1 + 9 + = 16
1 + 3 + = 12
2 + 2 + = 9
4 + 7 + = 19
8 + 4 + = 20
4 + 4 + = 12
3 + 9 + = 15
7 + 5 + = 16
4 + 9 + = 19