4. Integers
5.3. Types of Numbers
5.3.1. Odd and Even Numbers
5.3.2. Prime and Composite Numbers
5.3.3. Twin Primes
5.3.4. Prime Triplet
5.3.5. Co-Primes
5.3.6. Perfect Numbers
5.3.7. Tests of Divisibility
5.3.9. HCF and LCM
6. Fractions
7. Decimals
10. Unitary Method
13. Mensuration
14. Geometry
16. Linear Symmetry
17. Data Handling