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...
Sophia Learning
Sophia: Adding With Significant Figures
A brief presentation helping the learner understand how many significant figures to use when adding numbers.