USA
2. Addition
3. Subtraction
6. Division
9. Decimals
11.2. Shape
11.3.1. Map distances
11.3.2. Symmetry Around Us
11.3.3. Rotational Symmetry
11.3.4. Identifying Mirror Halves
11.3.5. Symmetry in Geometric Figures
11.3.6. Symmetry in Alphabets
11.3.7. Symmetry in Numerals
11.4. Geometric reasoning