Khan Academy
Khan Academy: Add and Subtract Mixed Numbers With Unlike Denominators 1
Practice adding and subtracting mixed numbers with different denominators. No regrouping required. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Education Place
Houghton Mifflin: Eduplace: Extra Practice Quiz Solve Equations W/rationals
Practice solving equations with rational numbers in them. Read the interactive quiz rules and then click on the "Begin" ticket. If you answer incorrectly you get one more chance to try again then you are told the correct answer. See how...