3.1.1. Finding Factors of a Number
3.1.5. Types of Numbers
3.1.5.1. Odd and Even Numbers
3.1.5.2. Prime and Composite Numbers
3.1.5.3. Twin Primes
3.1.5.4. Prime Triplet
3.1.6. Co-Primes
3.1.7. Perfect Numbers
3.4. HCF and LCM
6. Integers
7. Fractions
8. Decimals
10. Mensuration
11. Algebra
13. Symmetry