Numerical expressions
作者：Alen Delić
1. Numbers
2. Measurements
2.1. Weight
2.2. Distance
2.3. Height
2.4. Length
3. Mathematical expressions
3.1. Addition
3.2. Roots
3.3. Multiplication
3.4. Division
3.5. Percentage
3.6. Exponentiation
4. Other
4.1. Money
4.2. Date
4.3. Time
