CHRONO

10 s.

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

CHRONO

0 s.
2 + 4 + = 9
3 + 9 + = 19
6 + 6 + = 20
5 + 8 + = 14
6 + 4 + = 17
3 + 8 + = 20
2 + 2 + = 10
5 + 3 + = 9
5 + 6 + = 14
5 + 2 + = 8
3 + 4 + = 15
2 + 6 + = 15
1 + 8 + = 15
1 + 3 + = 10
4 + 4 + = 17
8 + 6 + = 16
3 + 8 + = 17
8 + 1 + = 14
5 + 7 + = 19
8 + 1 + = 18