Collection of riddles to improve your brain or to just spend some quality time

In '10 minutes with times tables' users can work the times tables across three levels :
- Level 1 : multiplication of one-digit numbers times one-digit.
- Level 2 : multiplication of two-digit numbers times one-digit.
- Level 3: Multiplication of four-digit numbers times three-digit.

If you work the ten diary minutes, you gradually notice how you will improve in maths.

NEW: Option 'Hand' to work since the app.

In '10 minutes with quadratic equations' users can work with this type of equations.
If you work the ten diary minutes, you gradually notice how you will improve in maths.

In '10 minutes with GCD and lcm' users can work the divisors and multiples across three levels :
- Level 1 : we work the factorization of numbers.
- Level 2 : we study the GCD.
- Level 3: we study the lcm.

If you choose the option 'Hand, you can work since the app.