1. Diagonal formula
|3 5; 2 7|: 3x7 - 5x2 = 11.
2x2 (1-5)
1 visual step / 2x2 diagonal difference
Practice Level 1
A few quick rounds make the products familiar; the sign is the only thing to guard.
Start Level1 visual step / 2x2 diagonal difference
|3 5; 2 7|: 3x7 - 5x2 = 11.
A few quick rounds make the products familiar; the sign is the only thing to guard.
Start Level