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 
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