Mental 2x2 and 3x3 determinants for Cramer's rule and linear systems. 20 progressive levels.
Why this matters
Determinants tell you whether a system has a unique answer and show up in geometry (areas, volumes), physics, and computer graphics. Useful long after the exam.
Group 1 Open workout. Not completed, 0 of 3 stars. 01 Level 1 Score 100 points in 57s Open workout. Not completed, 0 of 3 stars. 02 Level 2 Reach 150 points in 58s Open workout. Not completed, 0 of 3 stars. 03 Level 3 18 problems, no timer Open workout. Not completed, 0 of 3 stars. 04 Level 4 Stay accurate for 43s Open workout. Not completed, 0 of 3 stars. 05 Level 5 12 correct in 57s
Group 2 Open workout. Not completed, 0 of 3 stars. 06 Level 6 Score 115 points in 54s Open workout. Not completed, 0 of 3 stars. 07 Level 7 Reach 173 points in 56s Open workout. Not completed, 0 of 3 stars. 08 Level 8 21 problems, no timer Open workout. Not completed, 0 of 3 stars. 09 Level 9 Stay accurate for 41s Open workout. Not completed, 0 of 3 stars. 10 Level 10 14 correct in 54s
Group 3 Open workout. Not completed, 0 of 3 stars. 11 Level 11 Score 130 points in 51s Open workout. Not completed, 0 of 3 stars. 12 Level 12 Reach 195 points in 54s Open workout. Not completed, 0 of 3 stars. 13 Level 13 24 problems, no timer Open workout. Not completed, 0 of 3 stars. 14 Level 14 Stay accurate for 39s Open workout. Not completed, 0 of 3 stars. 15 Level 15 16 correct in 51s Recommended signed 3x3
Group 4 Open workout. Not completed, 0 of 3 stars. 16 Level 16 12 problems, no timer Open workout. Not completed, 0 of 3 stars. 17 Level 17 12 problems, no timer Open workout. Not completed, 0 of 3 stars. 18 Level 18 12 problems, no timer Open workout. Not completed, 0 of 3 stars. 19 Level 19 12 problems, no timer Open workout. Not completed, 0 of 3 stars. 20 Level 20 12 problems, no timer