Math Puzzles For Kids in 1st to 7th Grades - Math 4 Children Plus Math Puzzles For Kids - 1st to 7th Grades. Maths puzzles for children in 1st, 2nd, 3rd, 4th, 5th, 6th and 7th grades. These puzzles are fun activities for children and cover several math topics in the grades earlier mentioned. Each link below points to a printable PDF sheet which also has an answer sheet attached. Get kids more engaged with our challenging yet interesting math puzzles.