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Determinants

Level 20 - realistic untimed

3x3 open challenge (no timer)

6 visual blocks - diagonal and cofactor reading

1

Read the shape

Level 20 visual plan for 3x3 open challenge (no timer)
Identify matrix size and visible zeros. 3x3 open challenge (no timer).

Identify matrix size and visible zeros. 3x3 open challenge (no timer).

2

Pick the method

Determinants: block 2 Visual guide level shape 3x3 open challenge (no timer)Pick 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 3x3 open challenge (no timer)First 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 3x3 open challenge (no timer)CheckTrack 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 3x3 open challenge (no timer)Play 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 3x3 open challenge (no timer)Watch-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.

Level 19

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