There are several additional resources and reference books that can complement the CBSE Class 5 mathematics textbook and help students enhance their understanding and problem-solving skills. These resources provide extra practice, alternative explanations, and different perspectives on various mathematical concepts. Here are some recommended resources:

1. NCERT Exemplar:
The NCERT Exemplar books provide additional questions and exercises that go beyond the content covered in the textbook. These books contain a variety of challenging problems to help students deepen their understanding of mathematical concepts.

2. RD Sharma Mathematics:
RD Sharma is a popular reference book for mathematics that provides detailed explanations, solved examples, and a wide range of practice questions. It covers all the topics in the CBSE Class 5 curriculum and is known for its comprehensive approach.

3. Mathematics Olympiad:
Books specifically designed for Mathematics Olympiad preparation can be very helpful in providing challenging problems that require critical thinking and problem-solving skills. These books often cover a wide range of topics and can help students develop a deeper understanding of mathematics.

4. Mental Mathematics:
Books that focus on mental mathematics techniques can be useful in improving students' calculation speed and accuracy. These books provide strategies and tricks to perform calculations mentally, which can be beneficial in various mathematical problems.

5. Online Resources:
There are several websites and online platforms that offer educational resources and practice materials for CBSE Class 5 mathematics. One such platform is EduRev, which provides a wide range of study materials, practice papers, and video lessons for Class 5 mathematics.

6. Supplementary Workbooks:
Supplementary workbooks that are designed specifically for CBSE Class 5 mathematics can provide additional practice and reinforcement of concepts. These workbooks often include a variety of exercises, puzzles, and activities to engage students and help them apply their knowledge.

Using these additional resources alongside the CBSE Class 5 mathematics textbook can help students gain a deeper understanding of mathematical concepts, improve problem-solving skills, and enhance overall performance in the subject.