1.3. n Digit Numbers 
 1.4. Place of a Digit 
 1.7. Rounding Numbers 
 1.7.1. Rounding off numbers 
 1.7.1.1. Rounding off to the nearest ten 
 1.7.1.2. Rounding off to the nearest hundred 
 1.7.1.3. Rounding off to the nearest thousand 
 1.7.2. Estimating Sum 
 1.7.3. Estimating Difference 
 1.7.4. Estimating Products 
 1.7.5. Estimating Quotients 
 4. Integers 
 6. Fractions 
 7. Decimals 
 10. Unitary Method 
 13. Mensuration 
 14. Geometry 
 16. Linear Symmetry 
 17. Data Handling 
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