• #### Similarity Shortcuts - Problem 1

##### Math›Geometry›Similarity
How to find a missing side of a triangle using the AA similarity shortcut.
• #### Similarity Shortcuts - Concept

##### Math›Geometry›Similarity
How to determine if two triangles are similar using a shortcut.
• #### Why SSA and AAA Don't Work as Congruence Shortcuts - Concept

##### Math›Geometry›Triangles
How to determine which congruence shortcuts do not work and why.
• #### Similarity Shortcuts - Problem 2

##### Math›Geometry›Similarity
How to find a missing side of a triangle using the SAS similarity shortcut.
• #### Similarity Shortcuts - Problem 3

##### Math›Geometry›Similarity
How to determine if two triangles are similar using a shortcut.
• #### Difference of Perfect Squares - Problem 7

##### Math›Algebra›Factoring
Identifying binomials that are a difference of perfect squares and using shortcuts to factor them.
• #### Divisibility - Concept

##### Math›Pre-Algebra›Prime Numbers
Shortcuts to determine whether a number is a factor of another
Tags:
• #### Proportions - Problem 5

##### Math›Algebra›Solving Equations
Shortcuts for using "mental math" to solve proportional relationships
Tags:
• #### HL - Concept

##### Math›Geometry›Triangles
How to use the hypotenuse leg shortcut to determine the congruence of right triangles.
• #### Multiplying Polynomials - Problem 3

##### Math›Algebra 2›Polynomials
Using difference of perfect squares as a shortcut in multiplying a series of binomials.
Tags:
• #### HL - Problem 3

##### Math›Geometry›Triangles
How to solve for a variable to make two right triangles congruent using the HL shortcut.
• #### ASA and AAS - Concept

##### Math›Geometry›Triangles
How to use the ASA and AAS shortcuts to determine the congruence of two triangles.
• #### SSS and SAS - Concept

##### Math›Geometry›Triangles
How to use the SAS and SSS shortcuts to determine the congruence of two triangles.
• #### Multiplying Complicated Polynomials - Concept

##### Math›Algebra 2›Polynomials
How to multiply ?ugly? polynomials by looking for patterns.
• #### Series and Summation Notation - Problem 4

##### Math›Precalculus›Sequences and Series
Shortcut formulas for evaluating quadratic sums in Sigma notation.
Tags:
• #### HL - Problem 1

##### Math›Geometry›Triangles
How to use the hypotenuse-leg (HL) shortcut to determine the congruence of vertical triangles and how to correctly denote the congruence.
• #### Series and Summation Notation - Problem 5

##### Math›Precalculus›Sequences and Series
Shortcut formulas for evaluating linear sums in Sigma notation.
Tags:
• #### Series and Summation Notation - Problem 5

##### Math›Algebra 2›Sequences and Series
Shortcut formulas for evaluating linear sums in Sigma notation.
Tags:
• #### Multiplying Complicated Polynomials - Problem 1

##### Math›Algebra 2›Polynomials
How to multiply more complicated polynomials by looking for patterns.
• #### Series and Summation Notation - Problem 6

##### Math›Precalculus›Sequences and Series
Shortcut formulas for evaluating sums in Sigma notation that are neither arithmetic nor geometric.
Tags: