Across-Down Adding three-way Puzzle Book is for children and young learners. There are 30 plus puzzles, including answers for first, and second-grade students. These wonderful puzzles will help children with their mathematical problem-solving skills. Across-Down Adding three-way Puzzle Book is a fun activity workbook that reinforces addition skills. Children will have fun learning math while working these cool across-down math puzzles. Teachers and parents can use these fun puzzles to reinforce their students' math skills.