CHRONO

10 s.

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

CHRONO

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