Khan Academy (English - US curriculum)
Math by grade
Illustrative Mathematics
7th grade (Illustrative Mathematics)
Unit 1: Scale drawings
Unit 1: Scale drawings
Lesson 1: What are scaled copies?
Lesson 2: Corresponding parts and scale factors
Lesson 3: Making scaled copies
Lesson 5: The size of the scale factor
Lesson 6: Scaling and area
Lesson 7: Scale drawings
Lesson 9: Creating scale drawings
Lesson 11: Scales without units
Lesson 12: Units in scale drawings