CHRONO

10 s.

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

CHRONO

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