CHRONO

10 s.

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

CHRONO

0 s.
1 + 9 + = 14
5 + 3 + = 17
3 + 9 + = 17
5 + 5 + = 12
1 + 3 + = 11
1 + 7 + = 10
5 + 3 + = 15
2 + 8 + = 18
7 + 3 + = 14
6 + 5 + = 18
6 + 2 + = 13
9 + 6 + = 20
2 + 7 + = 10
1 + 1 + = 7
5 + 4 + = 10
1 + 8 + = 18
5 + 3 + = 11
2 + 4 + = 10
7 + 4 + = 20
4 + 9 + = 17