CHRONO

10 s.

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

CHRONO

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