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Instructional Video
Khan Academy

SAT Prep: Test 2 Section 6 Part 2

For Students 9th - 12th
Reviewing the last problem from the previous video because he feels that he "rushed it," Sal again explains the concept of ratios as it applies to problem 6 on the practice SAT (page 472 in The Official SAT Study Guide). Additional...
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Instructional Video
Khan Academy

Khan Academy: Multiplying and Dividing Negative Numbers

For Students 3rd - 8th Standards
A video showing the rules of multiplying and dividing negative numbers.