This math chapter workbook on "Multiplication and Mental Math," emphasizes the multiplication tables for 1 through 5, encouraging students to memorize them for quick recall. To build mental math skills, the teacher should teach simple multiplication strategies like doubling (e.g., using 2s facts) and using known facts to derive unknown ones, such as applying the commutative property (e.g., knowing 4 x 3 can help solve 3 x 4).