Addition and Subtraction - Multi-step Problems - Presentation

The presentation on multi-step problems in addition and subtraction is designed to enhance students' problem-solving skills. The lesson begins by encouraging students to discuss and recall vocabulary related to addition and subtraction, setting the stage for more complex calculations. As they progress, students encounter various scenarios requiring them to apply their mathematical understanding in a practical context. For example, they are presented with a scenario where a character named Esin opens a book to two numbered pages with a sum of 317 and are tasked with determining the next page number. The solution involves dividing the sum by two and reasoning that page numbers are consecutive, thus the next page would be 160.

The lesson continues with more intricate problems, such as figuring out the ages of characters given their relationships to each other and the combined sum of their ages. This activity requires the use of algebraic expressions and solving equations to find individual ages. Another problem involves a milkman's daily transactions of collecting and delivering bottles of milk, where students must calculate the remaining bottles. The presentation also challenges students with questions about earnings over a week, where they must perform calculations to find total amounts and explore more efficient methods of solving the problems. Throughout the lesson, key vocabulary, information extraction, and the use of models like the bar model are emphasized to aid in understanding and solving the multi-step problems.