MATHCOUNTS MINIS

A video resource created by Art of Problem Solving!

Art of Problem Solving's Richard Rusczyk, a MATHCOUNTS alumnus, has been creating MATHCOUNTS Minis videos for more than a decade! Minis provide detailed explanations for MATHCOUNTS problems and their associated math concepts, plus include activity sheets. They're great resources for math team practices or club meetings! Visit Art of Problem Solving for many more educational resources.

Great Minis for At-Home Learners
triangle
Mini #11

Tangent Segments & Similar Triangles

lines of text
Mini #19

Turning Word Problems into Algebra Equations

right triangle
Mini #22

Geometry: 30-60-90 Right Triangles

pattern
Mini #29

Sequences, Series and Patterns

shortcut
Mini #32

Using Algebra and Number Sense as Shortcuts

triangle and circle
Mini #34

Geometry: Circles and Right Triangles

parabola
Mini #38

Solving Quadratic Equations Using Substitution Simplification

magnifying glass
Mini #57

Number Sense: Looking for Patterns

directional signs
Mini #64

More Than One Way to Solve a Problem

Division
Mini #75

Strategic Guessing Using Divisibility Rules

path
Mini #85

Counting Paths

Average
Mini #93

Sequences and Central Tendency

Please select an option.
MINI #87 - USING GEOMETRIC MODELS TO DETERMINE PROBABILITY
Math Topic:
Coordinate Geometry, Plane Geometry, Probability, Counting and Combinatorics
Common Core State Standard:
7.G.6, S-CP.9
Difficulty:
Medium
MINI #88 - MORE 30-60-90 RIGHT TRIANGLES
Math Topic:
Algebraic Expressions and Equations, Plane Geometry
Common Core State Standard:
G-C.2, G-SRT.6
Difficulty:
Difficult
MINI #89 - LOOKING FOR PATTERNS AND OTHER STRATEGIES
Math Topic:
Number Theory, Sequences, Series and Patterns
Common Core State Standard:
F-BF.2
Difficulty:
Difficult
MINI #90 - EVEN MORE ANALYTIC GEOMETRY
Math Topic:
Coordinate Geometry
Common Core State Standard:
6.G.3, 7.G.6
Difficulty:
Difficult
MINI #91 - FACTORIALS
Math Topic:
Number Theory
Common Core State Standard:
S-CP.9
Difficulty:
Medium
MINI #92 - PROBABILITY PROBLEM SOLVING
Math Topic:
Probability, Counting and Combinatorics
Common Core State Standard:
S-CP.3, S-CP.9
Difficulty:
Easy
MINI #93 - SEQUENCES AND CENTRAL TENDENCY
Math Topic:
Sequences, Series and Patterns, Statistics and Data
Common Core State Standard:
F-BF.2, S-CP.9
Difficulty:
Medium
MINI #94 - MAKE A SKETCH
Math Topic:
Algebraic Expressions and Equations, Plane Geometry, Problem Solving (Misc.)
Common Core State Standard:
8.G.7, G-C.2, SMP
Difficulty:
Medium
MINI #95 - RIGHT TRIANGLES
Math Topic:
Plane Geometry
Common Core State Standard:
7.G.6
Difficulty:
Medium
MINI #96 - DIFFERENCE OF SQUARES
Math Topic:
Algebraic Expressions and Equations
Common Core State Standard:
A-SSE.2
Difficulty:
Medium
MINI #97 - THREE-DIMENSIONAL FIGURES
Math Topic:
Solid Geometry
Common Core State Standard:
7.G.6, G-GMD.3
Difficulty:
Difficult
MINI #98 - EVEN MORE SEQUENCES, SERIES AND PATTERNS
Math Topic:
Sequences, Series and Patterns
Common Core State Standard:
F-BF.2
Difficulty:
Difficult
MINI #99 - CONDITIONAL PROBABILITY
Math Topic:
Probability, Counting and Combinatorics
Common Core State Standard:
S-CP.3, S-CP.6, S-CP.9
Difficulty:
Difficult
MINI #100 - CAREFUL COUNTING: A MEASUREMENT LESSON
Math Topic:
Measurement
Common Core State Standard:
S-CP.9, SMP
Difficulty:
Easy

There's no activity sheet, but we know you will enjoy this video.

It's the 100th MATHCOUNTS MINI Lesson!

We're taking a break from uploading new Mini Lessons for a while, which makes this the perfect time to dive into our collection of 100 Mini Lessons to revisit some of your favorites.