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Determinants

Level 8 - realistic untimed

3×3 with full column of zeros

6 visual blocks - diagonal and cofactor reading

1

Read the shape

Level 8 visual plan for 3×3 with full column of zeros
Identify matrix size and visible zeros. 3×3 with full column of zeros.

Identify matrix size and visible zeros. 3×3 with full column of zeros.

2

Pick the method

Determinants: block 2 Visual guide level shape 3×3 with full column of zerosPick the methodUse diagonals for 2x2; sparse cofactors for 3x3. image-first, then practice
Use diagonals for 2x2; sparse cofactors for 3x3.

Use diagonals for 2x2; sparse cofactors for 3x3.

3

First move

Determinants: block 3 Visual guide level shape 3×3 with full column of zerosFirst moveChoose the row or column with least work. image-first, then practice
Choose the row or column with least work.

Choose the row or column with least work.

4

Check

Determinants: block 4 Visual guide level shape 3×3 with full column of zerosCheckTrack the sign before calculating. image-first, then practice
Track the sign before calculating.

Track the sign before calculating.

5

Play the mode

Determinants: block 5 Visual guide level shape 3×3 with full column of zerosPlay the modeSpend the extra second on the check. image-first, then practice
Spend the extra second on the check.

Spend the extra second on the check.

6

Watch-out

Determinants: block 6 Visual guide level shape 3×3 with full column of zerosWatch-outA zero row or column ends the problem. image-first, then practice
A zero row or column ends the problem.

A zero row or column ends the problem.

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