Word problems, one or more variables
Max-min problems not requiring calculus
Problems found in "brain-teaser" type books
Logic puzzles, including the use of Venn Diagrams
Ratio and proportion
Segments intercepted by parallel lines
Identification of similar/congruent figures
Ratios of areas and volumes
Elementary trigonometric ratios
Permutations, with and without replacement
Combinations, with and without replacement
Using the principle of inclusion, exclusion
Using the binomial and multinomial expansions
Nonnegative integer solutions to x1+x2+...+xn = b.
Definition, simple applications of probability (when to multiply, when to add)
Instructional Videos: #1-10 #11-15 A better response to 12B #11