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
5.3.9.1. HCF (Highest Common Factor)
6. Fractions
7. Decimals
10. Unitary Method
13. Mensuration
14. Geometry
16. Linear Symmetry
17. Data Handling