CHRONO

10 s.

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

CHRONO

0 s.
8 + 6 + = 20
4 + 3 + = 14
6 + 1 + = 9
9 + 6 + = 18
3 + 4 + = 16
4 + 8 + = 18
4 + 8 + = 19
2 + 4 + = 7
3 + 6 + = 14
1 + 2 + = 12
7 + 5 + = 18
1 + 3 + = 5
7 + 5 + = 13
2 + 8 + = 12
7 + 1 + = 17
6 + 8 + = 20
7 + 5 + = 14
8 + 4 + = 18
3 + 2 + = 8
7 + 6 + = 17