Fifth unit
classify
The second volume of the first grade
The Eighth Unit
Find a pattern
The first volume of grade two
The Eighth Unit
Simple logical reasoning of permutation and combination
The second volume of grade two
Ninth unit
Find a pattern
The first volume of grade three
Ninth unit
permutation and combination
The second volume of grade three
Ninth unit
Overlapping problem
The first volume of the fourth grade
Unit 7
Pancake problem
queuing theory
Tian Ji horse racing
The second volume of the fourth grade
The Eighth Unit
Tree planting problem
The first volume of the fifth grade
Unit 7
digital coding
The second volume of the fifth grade
Unit 7
Looking for defective products
The first volume of the sixth grade
Unit 7
The chicken and the rabbit are in the same cage.
The second volume of the sixth grade
Fifth unit
drawer principle