- Probability, Counting and Combinatorics

This plan will help Mathletes to develop a strategic approach to counting the occurrences of a certain shape in a more complex figure made of multiple intersecting lines.

- Probability, Counting and Combinatorics

- Probability, Counting and Combinatorics

This plan builds on what Mathletes already know about ratios to introduce the definition of probability as a ratio of desired outcomes to total outcomes. Mathletes will then practice calculating the...

- Probability, Counting and Combinatorics

Explore combinatorics by looking at a common type of MATHCOUNTS counting problem – counting paths between two points. End with an extension that connects counting paths to another type of combinatoric...

- Algebraic Expressions and Equations

An important formula to know, the difference of squares identity is derived geometrically in the video for this practice plan. Mathletes will then try to recognize the difference of squares structure...

- Number Theory

Calculating the least common multiple is something many Mathletes are asked to do, but in this plan they will use their understanding of the least common multiple to stretch themselves to solve more...

- Probability, Counting and Combinatorics

This plan will introduce Mathletes to The Fundamental Counting Principle – a faster method to determining the total number of possible outcomes of an event without listing them all out!

- Probability, Counting and Combinatorics

Video by Art of Problem Solving's Richard Rusczyk.

- Number Theory
- Probability, Counting and Combinatorics

Video by Art of Problem Solving's Richard Rusczyk.

- Algebraic Expressions and Equations

Video by Art of Problem Solving's Richard Rusczyk.

- Probability, Counting and Combinatorics

Video by Art of Problem Solving's Richard Rusczyk.