GRADE 7 MATH · CHAPTER 2
Ratios, rates & percentages
Study each lesson in order, or choose the idea you need today.
- Choose a book
- Choose a chapter
- Study a lesson
Ratios, rates & percents
Use a scale drawing
Convert a drawing measurement to a real measurement using a scale.
Ratios, rates & percents
Calculate simple interest
Calculate interest on an unchanged principal over whole years.
AN EXAMPLE FROM THIS CHAPTER
A scale drawing uses 1 cm for 100 cm in real life. A line on the drawing is 2 cm long. What is its real length in centimeters?
Show answer & explanation
200
Each drawing centimeter represents 100 real centimeters. 2 × 100 = 200 cm.
Curriculum & source notes
These are original Little Play study books organized around U.S. school topics. The official curriculum references below guide topic scope and progression. Coverage is selected, not a complete curriculum or a verified match to every state standard. They are not copies of a publisher’s textbook. Check your school’s syllabus and book edition.
High-school courses can be taken in different years. Choose the topic that matches the student’s current course.
Read all curriculum references →