Help students master addition and subtraction within 5, 10, and 20 using engaging number line worksheets and hands-on practice! This Valentine’s Day-themed resource builds fluency with counting on and counting back, supports math fact strategies, and reinforces number line addition and subtraction. Perfect for first grade math centers, independent work, or morning practice, this resource strengthens understanding of math facts to 5, 10, and 20. Boost your students’ confidence with fun and effect