Lesson: Column Subtraction of Three-Digit Numbers: Subtracting across Zeros Elementary School • Mathematics • 3rd Grade • Math in Focus • Singapore Math • Grade 2 • Volume A • Common Core • Glencoe • Algebra 1 • Common Core • Go Math! • Grade 2 • Common Core • Math Connects • Concepts, Skills, and Problem Solving • Course 1 • Student Edition • enVisionmath2.0 • Grade 2 • Volume 2 • Common Core