CHRONO

10 s.

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

CHRONO

0 s.
7 + 3 + = 11
8 + 3 + = 19
2 + 1 + = 8
4 + 9 + = 20
3 + 4 + = 12
2 + 1 + = 6
9 + 7 + = 18
4 + 9 + = 14
1 + 5 + = 13
1 + 9 + = 13
7 + 2 + = 11
1 + 8 + = 14
7 + 5 + = 16
6 + 3 + = 16
1 + 6 + = 15
5 + 9 + = 20
5 + 6 + = 16
2 + 8 + = 14
7 + 5 + = 17
3 + 6 + = 10