3. Estimation
6. Integers
7. Fractions
9. Decimals
11. Unitary Method
12. Percentage
13. Profit and Loss
14. Simple Interest
15. Exponents
18. Mensuration
19. Geometry
20.1. Linear Symmetry
20.2. Rotational Symmetry
20.2.1. Rotational Symmetry in Figures
20.2.3. Rotational Symmetry in Alphabets
22. Probability
23. Data Handling
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