Explain that there are different ways in which you can subtract to 10,000 with simple numbers. Show the example of the girl, who solves the problem by simplifying the numbers. Then show the example of the boy who solves the problem by splitting the numbers. Have the students solve the following two problems on their own. Afterwards, discuss the different methods of solving the problem. Now show the problem 7,800 - 531. To solve this problem, the girl makes the number one less. The other girl solves the problem by splitting up the number. Have the students solve the next two problems on their own. Then discuss the different methods to solve the problem. For the story problem, you start by taking the problem out of the story. Then you show which methods you can use to solve the problem in steps. Have the students solve the next two story problems on their own.
Check whether the students can subtract to 10,000 with simple numbers using the following question:
- How can you subtract to 10,000 with simple numbers in steps?