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Determinants

Read determinant pictures: diagonals for 2x2, least-work cofactors for 3x3.

For |8 2; 4 6|, read 8x6 - 2x4. For 3x3, choose the sparse row or column first.

Level Guides

20 level-fit visual guides.

Level 1 visual plan for 2x2 (1-5)

Level 1 / foundation

2x2 (1-5)

1 visual step

Level 2 visual plan for 2x2 (1-9)

Level 2 / foundation

2x2 (1-9)

1 visual step

Level 3 visual plan for 2x2 mixed (+/-5)

Level 3 / realistic untimed

2x2 mixed (+/-5)

1 visual step

Level 4 visual plan for 2x2 mixed (+/-9)

Level 4 / foundation

2x2 mixed (+/-9)

1 visual step

Level 5 visual plan for 2x2 mixed (+/-12)

Level 5 / foundation

2x2 mixed (+/-12)

1 visual step

Level 6 visual plan for 2x2 mastery (+/-15)

Level 6 / foundation

2x2 mastery (+/-15)

1 visual step

Level 7 visual plan for 3x3 with full row of zeros

Level 7 / build-up

3x3 with full row of zeros

2 visual steps

Level 8 visual plan for 3x3 with full column of zeros

Level 8 / realistic untimed

3x3 with full column of zeros

2 visual steps

Level 9 visual plan for 3x3 triangular (upper)

Level 9 / build-up

3x3 triangular (upper)

3 visual steps

Level 10 visual plan for 3x3 triangular (lower)

Level 10 / build-up

3x3 triangular (lower)

3 visual steps

Level 11 visual plan for 3x3 (1-4)

Level 11 / build-up

3x3 (1-4)

3 visual steps

Level 12 visual plan for 3x3 (+/-4)

Level 12 / build-up

3x3 (+/-4)

3 visual steps

Level 13 visual plan for 3x3 sparse (+/-6)

Level 13 / realistic untimed

3x3 sparse (+/-6)

3 visual steps

Level 14 visual plan for 3x3 (+/-6)

Level 14 / mastery

3x3 (+/-6)

3 visual steps

Level 15 visual plan for 3x3 mastery (+/-9)

Level 15 / mastery

3x3 mastery (+/-9)

3 visual steps

Level 16 visual plan for 2x2 realistic signed (no timer)

Level 16 / realistic untimed

2x2 realistic signed (no timer)

3 visual steps

Level 17 visual plan for 2x2 realistic open (no timer)

Level 17 / realistic untimed

2x2 realistic open (no timer)

3 visual steps

Level 18 visual plan for 3x3 sparse realistic (no timer)

Level 18 / realistic untimed

3x3 sparse realistic (no timer)

3 visual steps

Level 19 visual plan for 3x3 triangular realistic (no timer)

Level 19 / realistic untimed

3x3 triangular realistic (no timer)

3 visual steps

Level 20 visual plan for 3x3 open challenge (no timer)

Level 20 / realistic untimed

3x3 open challenge (no timer)

3 visual steps

Practice this category

Use the method on live determinants levels.

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