Test your knowledge of taxicab geometry, triangular numbers, the golden ratio and more.

Teach your children 4th grade math skills like fractions, multiplication and division. In fourth grade, students learn to solve multi-step word problems and deepen their understanding of fractions.

For four years, the computer scientist Trieu Trinh has been consumed with something of a meta-math problem: how to build an A.I. model that solves geometry problems from the International ...