The Math Criss-Cross books are an exciting and unique way to practice math facts. The books are filled with white pages with black printed grid puzzles. Just like crossword puzzles only math! The books have a variety of brightly colored themed objects on each page. The student’s fact memory recall and speed should increase, all while having fun. The Times Tables edition contains multiplication and division up through 12, plus symbols and a few extra challenge pages. There is an instruction page in front and a reduced-size answer key in the back.