- unit of currency (euro and cent)
- units of length in the metric system
- units of time
- units of weight in the metric system
- units of volume in the metric system
- units of area in the metric system

- Rule of Three Cross-multiplication
- Percentage Calculator
- interest Calculator
- compound interest calculator

- prime numbers from 1 to 10
- prime numbers from 1 to 20
- prime numbers from 1 to 50
- prime numbers from 1 to 100
- prime numbers from 1 to 200
- prime numbers from 1 to 500
- prime numbers from 1 to 1000

- The first 20 square numbers
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- The first 400 square numbers
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