Mathematics for children. This website contains free content covering math topics for children in kindergarten, 1st, 2nd, 3rd, 4th, 5th, 6th, and 7th grade. Each topic is covered with various resources such as math for kids, puzzles, worksheets, flashcards, board games, interactive quizzes and more. We are constantly looking for the best ideas that make our collection one of the best. We recently launched a series of interactive games where kids can test almost any skill online.