Addition and Subtraction (Within 20) is an Early Mathematics workbook designed to help young learners strengthen their calculation and problem-solving skills through engaging and interactive activities. The book introduces addition and subtraction within 20 using simple explanations, number exercises, and step-by-step practice tasks that build confidence in basic arithmetic. With colorful illustrations and hands-on learning activities, it improves counting accuracy, logical thinking, and understanding of number relationships. Ideal for classroom learning and home practice, it provides a strong foundation for future maths learning.