Wrongifying Operators

Wrongifying Operators

Wrongifying Operators (MathPickle, 2012) Epic failure of arithmetic – when our operators (addition, subtraction, multiplication and division) fail to give us the answer! It is fun for students to see when things don’t work. It also forces them to be...
Fractions = Decimals using Algebra

Fractions = Decimals using Algebra

Desimal Deja-vu (MathPickle, 2013) Fractions and decimals are connected in magical ways. Here we convert from fractions to decimals and from decimals to fractions. This requires algebra. There’s a good case to be made that having fun is a key evolutionary...
EKG Sequences – factorization

EKG Sequences – factorization

Tree of Numbers – EKG Sequences (MathPickle, 2014) Student groups should work independently and then collaboratively to find when these integer sequences converge. Neil Sloane introduced me to the first EKG sequence in 2014. Its beauty and suitability for the...
1-100 Composite Connector Challenge

1-100 Composite Connector Challenge

1-100 Composite Connector Challenge This is a challenge for a class that has nothing to do except rejoice in connecting numbers that share common prime factors. The highest score that I've managed is 195, but I don't use computers so this can almost certainly be...
Gozen (factorization game)

Gozen (factorization game)

Gozen (MathPickle, 2025) Here is the pdf of Gozen. It is a game that has benefited from years of classroom experience. It is much simpler than the original thanks to Harini Fredrickson’s feedback in 2024. It is the best game I’ve designed for the...