Khan Academy (English - US curriculum)
Math by grade
Illustrative Mathematics
7th grade (Illustrative Mathematics)
Unit 5: Rational number arithmetic
Unit 5: Rational number arithmetic
Lesson 1: Interpreting negative numbers
Lesson 2: Changing temperatures
Lesson 3: Changing elevation
Lesson 4: Money and debts
Lesson 5: Representing subtraction
Lesson 6: Subtracting rational numbers
Lessons 1-6: Extra practice
Lesson 7: Adding and subtracting to solve problems
Lesson 9: Multiplying rational numbers
Lesson 10: Multiply!
Lesson 11: Dividing rational numbers
Lesson 12: Negative rates
Lesson 13: Expressions with rational numbers
Lesson 14: Solving problems with rational numbers
Lesson 15: Solving equations with rational numbers