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- Number System (Consolidating the Sense of Numberness)
- Estimation
- Numbers in India and International System (With Comparison)
- Place Value
- Natural Numbers and Whole Numbers (Including Patterns)
- Negative Numbers and Integers
- Number Line
- HCF and LCM
- Playing with Numbers
- Sets
- Ratio
- Proportion (Including Word Problems)
- Unitary Method
- Fractions
- Decimal Fractions
- Percent (Percentage)
- Idea of Speed, Distance and Time
- Fundamental Concepts (Algebra)
- Fundamental Operations (Related to Algebraic Expressions)
- Substitution (Including Use of Brackets as Grouping Symbols)
- Framing Algebraic Expressions (Including Evaluation)
- Simple (Linear) Equations (Including Word Problems)
- Fundamental Concepts (Geometry)
- Angles (With their Types)
- Properties of Angles and Lines (Including Parallel Lines)
- Triangles (Including Types, Properties and Construction)
- Quadrilateral
- Polygons
- The Circle
- Revision Exercise on Symmetry (Including Constructions on Symmetry)
- Recognition of Solids
- Perimeter and Area of Plane Figures
- Data Handling (Including Pictograph and Bar Graph)
- Mean and Median

13 + 15 = ____ .

Answer:

13 + 15 = 28

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