4. Integers
5.1.1. Finding Factors of a Number
5.1.5. Types of Numbers
5.1.5.1. Odd and Even Numbers
5.1.5.2. Prime and Composite Numbers
5.1.5.3. Twin Primes
5.1.5.4. Prime Triplet
5.1.6. Co-Primes
5.1.7. Perfect Numbers
5.4. HCF and LCM
6. Fractions
7. Decimals
10. Unitary Method
13. Mensuration
14. Geometry
16. Linear Symmetry
17. Data Handling