Addition and Subtraction Number Line Worksheets, Activities & Guideline 1st,2nd and Kindergarten Master Number Line Math Addition and Subtraction: Do your students need a powerful tool to truly understand addition and subtraction on a number line? This packet is designed to build confidence with addition and subtraction within 0-10 and 0-20. Each problem provides a clear number line, making it easy for students to visualize counting on for addition and counting back for subtraction. What's