CHRONO

10 s.

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

CHRONO

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