The teacher has used a mathematical problem that is related to 'Simple and compound Interest' that has two ways of finding solutions. As a teacher, you may try different methods. Apart from presenting mathematical problems, we can use the following strategies that will help children to develop critical thinking:
1
Encourage children to attempt open problems and questions with multiple solutions.
2
Children may be asked to find real life situations that have application of Mathematics.
3
Make children understand what they are supposed to do about problems.
4
all of the above