LearnLogical ReasoningVenn Diagrams & Visual Reasoning
10.04 · Venn Diagrams & Visual Reasoning
Cubes & Dice
Elite lesson10 rules10 questions
On the syllabus of
Video
Rules
At a glance 10 rules
- 1Painted cube, n per edge
- 2Painted a × b × c block
- 3Bare or coloured facesWith some faces bare or in different colours, sort small cubes by place: a corner touches 3 big faces, an edge cube 2, a face cube 1. Then read off the paint place by place.
- 4Cuts and pieces
- 5Hidden cubesPeel one layer off each face that can be seen. For n per edge, stay hidden on the floor and in a room's corner.
- 6Standard dieOpposite faces add to 7: 1-6, 2-5, 3-4. If two numbers seen side by side add to 7, the die is not standard.
- 7Seen together, never oppositeNumbers seen next to X in any view are never opposite X; once four neighbours are known, the sixth is opposite. Two views sharing two numbers: the two leftovers are opposite.
- 8Two views, one sharedOne shared: the number in neither view is opposite it. Turn one view so the shared number sits as in the other, then faces in the same place are opposite pairs.
- 9NetsIn a straight run of three squares the end squares are opposite, and so are the end squares of a Z-shaped run of four. Opposite squares never share an edge.
- 10Rolling a dieA roll to the east sends the top face east, the east face down, the bottom face west and the west face up. Track every roll in order: rolls do not cancel.
Test yourself
Tap an option to answer. The first tap counts.
- Q1Easy
A wooden cube painted on all six faces is cut into 216 equal smaller cubes. How many of the smaller cubes have no paint at all?
Correct answer64
Why
Painted cube: the unpainted cubes form the inner block, .
216 cubes means along each edge, so the inner block is .
So 64 smaller cubes have no paint.
- Q2Easy
A standard die, whose opposite faces add up to 7, rests on a table with 4 on top. What is the sum of the numbers on its four side faces?
Correct answer14
Why
On a standard die the side faces are the two opposite pairs that are not top and bottom.
Top and bottom are 4 and 3, which take 7 out of the total .
So the four side faces add up to 14.
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