Ladder Problems https://www.mathematische-basteleien.de/ladder.htm
There are two similar triangles (yellow) and you have (##) x:b=b:y.
Dein Suchergebnis zum Thema: have/"<b
Square https://www.mathematische-basteleien.de/square.htm
There is the first binomial theorem (a+b)²=a²+2*a*b+b². ……
MacMahon’s Coloured Cubes https://www.mathematische-basteleien.de/macmahon.htm
The columns are called a, b, c, d, e, f, the lines A, B, C, D, E, F.
Cube https://www.mathematische-basteleien.de/cube.htm
If you have the choice of the following four drawings most people would choose picture
Rubik’s Cube https://www.mathematische-basteleien.de/rubikscube.htm
Probably you will have to repeat this sequence.
Pentominos https://www.mathematische-basteleien.de/pentominos.htm
You must arrange the squares, so that they must have in common at least one side.
Tangrams https://www.mathematische-basteleien.de/tangrams.htm
The difference is: You have to change the rational und irrational length of a side
Cuboctahedron https://www.mathematische-basteleien.de/cuboctahedron.htm
Opposite areas have the same colours.
Square Numbers https://www.mathematische-basteleien.de/squarenumber.htm
The letters a, b, and c stand for digits.
Peg Solitaire https://www.mathematische-basteleien.de/solitaire.htm
You have to remove the pegs one after the other by jumping horizontally or vertically