Practice finding percentages of numbers in this math memory game for children in 3rd, 4th, 5th and 6th grades. Math memory interactive online fun game. This game is an interactive online test for children to practice their skills on fractions and percentages. Each game has multiple choice answers to problems. These games are suitable homeschool and classroom practice for children 3rd, 4th, 5th, 6th and 7th grades. Click start and begin practicing. Math is fun.