Both books in excellent condition. No writing inside! Slight wear on covers seen in pictures but very minor. The “Primary Mathematics 4A and 4B Teachers Guides” are textbooks published by Marshall Cavendish in English. Authored by Dr. Janice Cordes and Jessica Kaminski, these spiral-bound books are part of the “Primary Mathematics” series and are specifically designed for elementary school students in Singapore. The guides provide homeschool teachers with teaching methods and materials focused on mathematics, making them a valuable resource for educators looking to help students learn and excel in the subject area.