Mental Math 5th Grade - Math Salamanders All the free 5th Grade Math Worksheets in this section follow the Elementary Math Benchmarks for Grade 5. Math Games 5th Grade 5th Grade Online Math Games. At Primary games.com you will find a bank of online math games to play at a 5th grade level. Using the games will help your child develop their skills in a fun and motivating way. Using the link below will open the primary …