Khan Academy (English - US curriculum)
Math by grade
Illustrative Mathematics
7th grade (Illustrative Mathematics)
Unit 5: Rational number arithmetic
Lesson 6: Subtracting rational numbers
Lesson 6: Subtracting rational numbers
Interpreting numeric expressions example
Interpret negative number addition and subtraction expressions
Adding & subtracting negative fractions
Absolute value as distance between numbers
Absolute value to find distance
Adding & subtracting rational numbers
