My name is Russell Lim. I teach high school mathematics in Melbourne, Australia.

Subscribe if you enjoy ✨nice✨ mathematics problems! Many of these problems are sourced from high school mathematics competitions. These are problems that are interesting to think about, and when you solve it (or see the solution), you say yes that's nice.

You can find more nice math problems at www.medium.com/nice-math-problems

This Graph Theory Problem has a Clever Solution You Wouldn't Expect ✨
4:53
This Graph Theory Problem has a Clever Solution You Wouldn't Expect ✨
Beautifully Simple Number Theory Problem (INMO 2025)
7:41
Beautifully Simple Number Theory Problem (INMO 2025)
Can These Cubics Have Integer Roots Only? (Indian Math Olympiad)
8:42
Can These Cubics Have Integer Roots Only? (Indian Math Olympiad)
Beautiful Korean High School Exam Problem - Collatz Style Sequence!
9:15
Beautiful Korean High School Exam Problem - Collatz Style Sequence!
Nice System of Equations from American Math Competition (2024 AMC10A)
3:59
Nice System of Equations from American Math Competition (2024 AMC10A)
Overlapping Rectangles Problem - How Many Squares CAN'T You Cover?
10:15
Overlapping Rectangles Problem - How Many Squares CAN'T You Cover?
Can You Find Integer Solutions? (Intermediate Math Olympiad)
2:57
Can You Find Integer Solutions? (Intermediate Math Olympiad)
AMAZING Indian Math - Why π/4 = 1 - 1/3 + 1/5 - 1/7 + ...
10:39
AMAZING Indian Math - Why π/4 = 1 - 1/3 + 1/5 - 1/7 + ...
Simple Sequence Stumps the World's Best! (IMO 2024 Problem 3)
15:52
Simple Sequence Stumps the World's Best! (IMO 2024 Problem 3)
IMO 2024 Problem 1 (Explain it Like I'm 12)
16:07
IMO 2024 Problem 1 (Explain it Like I'm 12)
Yes Gao Kao Math is HARD! 🤯
11:53
Yes Gao Kao Math is HARD! 🤯
When 3 Right Triangles Form a Pyramid...
6:31
When 3 Right Triangles Form a Pyramid...
What Happens When These 8 Planes Slice a Cube? 🤔
2:22
What Happens When These 8 Planes Slice a Cube? 🤔
#desmos animation - spinning stars ✨
6:55
#desmos animation - spinning stars ✨
An Ambiguous Clock (or is it? 😉) #math #amc
6:51
An Ambiguous Clock (or is it? 😉) #math #amc
Nice Factorial Equation - Can You Solve It?
4:43
Nice Factorial Equation - Can You Solve It?
Calculating sin(π/5) Using a Regular Pentagon
3:50
Calculating sin(π/5) Using a Regular Pentagon
The Golden Ratio Appears ... But WHY? 🧐
4:23
The Golden Ratio Appears ... But WHY? 🧐
Find All Positive Integers (a,b,c) - China Girls Math Olympiad 2023
7:57
Find All Positive Integers (a,b,c) - China Girls Math Olympiad 2023
Trigonometry Only Q* Can Solve! 🤖👾👽
1:01
Trigonometry Only Q* Can Solve! 🤖👾👽
GPT-4 Makes Progress in Math
6:10
GPT-4 Makes Progress in Math
No Prime Factors Larger than 7? (Korean Math Olympiad 2023)
6:56
No Prime Factors Larger than 7? (Korean Math Olympiad 2023)
Toughest Ever 🙀 Australian Exam Question
8:49
Toughest Ever 🙀 Australian Exam Question
What is the Hexagon's Area? (JMO Prelim 2023)
2:03
What is the Hexagon's Area? (JMO Prelim 2023)
Nice Factoring Trick for 2023 UK Maths Challenge Problem
5:44
Nice Factoring Trick for 2023 UK Maths Challenge Problem
A Beautiful Graph Theory Prüf
6:03
A Beautiful Graph Theory Prüf
NICEST IMO Problem Ever? Ninja Says Yes! (IMO 2023 P5) #SoME3
9:52
NICEST IMO Problem Ever? Ninja Says Yes! (IMO 2023 P5) #SoME3
Olympiad Number Theory for Beginners - HOW to Solve IMO 2023 Problem 1
8:33
Olympiad Number Theory for Beginners - HOW to Solve IMO 2023 Problem 1
A Nice Number Puzzle from the 2023 Australian Mathematics Olympiad
6:34
A Nice Number Puzzle from the 2023 Australian Mathematics Olympiad