They align with the Romanian national curriculum, covering topics like natural numbers, operations, fractions, geometry, and measurement.

Many editions include specialized sections for review and testing to ensure students have mastered the material.

Born in 1942 in Argeș County, Ion Petrică was a distinguished mathematician and teacher who dedicated his career to improving mathematics education in Romania. He earned a doctorate in mathematics and became famous for authoring numerous "culegeri" (problem collections) that have guided generations of students through elementary and middle school.

The "Petrică" collections cover a wide range of educational levels, though some of the most sought-after PDF versions include: