- $3.98Bits and Pieces II : Using Rational Numbers by Glenda LappanBetter World Books
- $1.99Math for Kids: Rational Numbers Word Puzzles: Interactive Quiz eBook (Math for Kids (Sixth Grade) 6)Amazon
- $6.95Lumos Ratios & Proportional Relationships and The Number System Skill Builder, Grade 7 - Ratios and Percents, Rational Numbers: Plus Online Activities, Videos and Apps (Lumos Math Skill Builder)Amazon