While primarily a video platform, Khan Academy provides downloadable "Course Summaries" and practice sets for 5th Grade. It’s an excellent companion to any textbook.

Introduction to graphing ordered pairs on a grid.

Perfect for targeted practice on specific 5th-grade hurdles like long division or fractions. What to Look for in a Grade 5 Curriculum

While OpenStax is famous for college texts, their K-12 partners provide rigorous, peer-reviewed materials. Look for their "Elementary Math" series which focuses on deep conceptual understanding rather than just rote memorization.