Using the comparison model, this video teaches how to approach a given 2-step problem sum on addition and subtraction, and shows the detailed steps of how to solve it. More examples at http://my.homecampus.com.sg/Learn/Pri...
Question in the video:
Bakery A sold 2088 muffins.
Bakery B sold 621 more muffins than Bakery A.
What is the total number of muffins sold by the two bakeries?