3Blue1Brown
Olympiad level counting: How many subsets of {1,…,2000} have a sum divisible by 5?
Timestamps 0:00 - Puzzle statement and motivation 4:31 - Simpler example 6:51 - The generating function 11:52 - Evaluation tricks 17:24 - Roots of unity 26:31 - Recap and final trick 30:13 - Takeaways
Curated Video
KS2 Primary Maths Age 9-13 - Number and Place Value: Prime Numbers - Explained
SchoolOnline's Primary Maths videos are brilliant, bite-size tutorial videos delivered by examiners. Ideal for ages 9-13, they cover every key topic and sub topic covered in Maths in clear and easy to follow steps. This video looks at...
Curated Video
KS2 Primary Maths Age 9-13 - Multiplication with missing digits: - Explained
SchoolOnline's Primary Maths videos are brilliant, bite-size tutorial videos delivered by examiners. Ideal for ages 9-13, they cover every key topic and sub topic covered in Maths in clear and easy to follow steps. This video looks at...
Brian McLogan
3 Tips to Simplifying Radicals
In this video we will focus on learning the most important tips you need to know in order to simplify radicals. We will focus on the simplifying the square roots of variable expressions. 0:00 Intro 0:17 Know your square numbers 1:13 Use...
Curated Video
Genius Trick For A Devilishly Hard Math Problem - Sum Of 6s Puzzle
What is 6 + 66 + 666 + ... + 666...6? Each new number has one more digit equal to 6, and the last number has 666 digits of 6. Watch the video for a solution. My blog post for this video (includes 2 other solution methods):...
The Wall Street Journal
Jeremy Holland and Alisa Williams on The Private Equity Perspective
At WSJ Pro Private Equity, Jeremy Holland, Alisa Williams and WSJ Pro Private Equity Reporter, Laura Cooper discuss the path forward for the mid-market from the private equity perspective.
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Common Divisibility Examples
This video shows how to determine the prime factorization of a number to determine divisibility. Practice problems are available. [8:13]
Sophia Learning
Sophia: Even Numbers: Lesson 2
This lesson shows even numbers, or numbers which can be evenly divided by two. It is 2 of 13 in the series titled "Even Numbers."
Sophia Learning
Sophia: Even Numbers: Lesson 3
This lesson shows even numbers, or numbers which can be evenly divided by two. It is 3 of 13 in the series titled "Even Numbers."
Sophia Learning
Sophia: Even Numbers: Lesson 4
This lesson shows even numbers, or numbers which can be evenly divided by two. It is 4 of 13 in the series titled "Even Numbers."
Sophia Learning
Sophia: Even Numbers: Lesson 7
This lesson shows even numbers, or numbers which can be evenly divided by two. It is 7 of 13 in the series titled "Even Numbers."
Sophia Learning
Sophia: Even Numbers: Lesson 1
This lesson shows even numbers, or numbers which can be evenly divided by two. It is 1 of 13 in the series titled "Even Numbers."