Theory
Exercises
1. 
Solve the equation
Difficulty: easy 
1

2. 
Select the right answer
Difficulty: easy 
2

3. 
Verify the solution
Difficulty: easy 
1

4. 
Find the value of the variable
Difficulty: medium 
2

5. 
Answer the question
Difficulty: medium 
2

6. 
Solve the question
Difficulty: medium 
2

7. 
Find the age
Difficulty: hard 
4

8. 
Write the equation and find the cost of a chair
Difficulty: hard 
4

9. 
Find the numbers
Difficulty: hard 
4

Tests
1. 
Training test
Difficulty: easy 
3

2. 
Training test
Difficulty: medium 
5
