This document contains math exercises to find the highest common factor (HCF) of various number pairs and sets. It asks students to find the HCF of 12 and 30, 14 and 35, 8 and 20, 25 and 120, 60 and 144, 20 and 110, 132 and 540, 252 and 735, 18, 24 and 30, and 8, 20, 300, 48. The document is divided into two sections and provides the student and subject for attribution.