4 - Identities - Explanations

4 - Identities - Tetris

10 - Additions - Explanations

10 - Additions - Tetris

Addition de 2 numbers - Tempo = 6s - Level 2

11 - Additions with a hole - Explanations

11 - Additions with a hole - Tetris

Addition with a hole - Tempo = 6s  -  Level 4

15 - Sum of fractions - Explanations

15 - Sum of fractions - Tetris

18 - Simplification of the quotient of two first degree polynomials - Expanations  

18 - Simplification of the quotient of two first degree polynomials - Tetris

Indicate whether the fraction simplifies as 1 or -1