CHRONO

10 s.

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

CHRONO

0 s.
2 + 9 + = 18
6 + 2 + = 14
8 + 2 + = 15
9 + 8 + = 19
9 + 3 + = 20
5 + 1 + = 10
6 + 2 + = 16
1 + 9 + = 19
3 + 9 + = 16
8 + 2 + = 11
5 + 2 + = 16
1 + 3 + = 6
8 + 6 + = 15
2 + 4 + = 13
9 + 2 + = 18
1 + 5 + = 9
8 + 1 + = 17
4 + 7 + = 13
3 + 7 + = 17
4 + 8 + = 15