Identifying the opposite face in standard dice
medium
1 of 5 Lessons
Folding of open cubes into closed boxes
medium
2 of 5 Lessons
Counting triangles and squares in complex images
medium
3 of 5 Lessons
Number of rectangles and straight lines in a figure
medium
4 of 5 Lessons
Visualizing the total vertices and edges of polygons
medium
5 of 5 Lessons