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Determinants

Level 19 / realistic untimed

3x3 triangular realistic (no timer)

3 visual steps / realistic triangular product

1. Diagonal read

1. Diagonal readdiagonal -12, 15, -8.-12340-9001526000-8diagonal -12,15, -8multiplydiagonaldet = 1440
diagonal -12, 15, -8.

diagonal -12, 15, -8.

2. Multiply diagonal

2. Multiply diagonalmultiply diagonal.-12340-9001526000-8diagonal -12,15, -8multiplydiagonaldet = 1440
multiply diagonal.

multiply diagonal.

3. Determinant

3. Determinantdet = 1440.DeterminantRead the diagonal product.det = 1440.multiply diagonal
det = 1440.

det = 1440.

Practice Level 19

A few quick rounds make the products familiar; the sign is the only thing to guard.

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