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 
 5.1.5.2.1. Understanding Prime and Composite Numbers 
 5.1.5.2.2. Composite Numbers 
 5.1.5.2.3. Prime Numbers 
 5.1.5.2.4. Properties of Composite and Prime 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 
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