Khan Academy Static

Topic D includes lessons 11-12. "Use place value understanding to fluently add multi-digit whole numbers using the standard addition algorithm and apply the algorithm to solve word problems using tape diagrams. Solve multi-step word problems using the standard addition algorithm modeled with tape diagrams and assess the reasonableness of answers using rounding." EngageNY (Currently, we do not have content for Lesson 12.)

8753_Adding_3_digit_numbers.html

8755_Adding_3_digit_numbers_with_regrouping.html

8754_Adding_with_regrouping.html