CHRONO

10 s.

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

CHRONO

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