Level 1 Lesson 5 Length: 15 minutesComplexity: Easy Level 1 Lesson 1 Length: 15 minutesComplexity: Easy Level 1 Lesson 2 Length: 15 minutesComplexity: Easy Level 1 Lesson 3 Length: 15 minutesComplexity: Easy Level 1 Lesson 4 Length: 15 minutesComplexity: Easy