Math and Logic Puzzles
February 11, 2019 Leave a comment
According to Jack Ma:
The key feature skills of the Future are:
– Value
– Believing
– Independent thinking
– Team work
– Care of others
In the future, it is not about a competition of knowledge, it is a competition of creativity, it is a competition of imagination, it is a competition of learning.
January 2, 2019 Leave a comment
Big Ben is the nickname for the Great Bell of the clock at the north end of the Palace of Westminster in London, United Kingdom. 
A pile of old coins helps to keep the clock mechanism accurate. The pennies are stacked on the pendulum of the clock and have acted as weights. Adding or taking away coins effects the pendulum’s centre of mass and the rate at which it swings. A single penny will change the clock’s speed by two fifths of one second per day.
How does the weekly time change if we add 5 pennies to the pendulum?
At twelve o’clock, twelve chimes ring from the great bell in 44 seconds. ## How long does it takes to ring the hours at 15:00 ?
December 1, 2018 Leave a comment
New challenges:
What is the easiest way to make it correct? Answer
In what Olympic sport does the winner cross the line facing backwards? Answer
What time is it? Answer
What is the necessary mirror size? Answer
Find all 18 best puzzles at
November 4, 2018 Leave a comment
Singapore math is a teaching method based on the national mathematics curriculum used for kindergarten through sixth grade in Singapore. Singapore math, also known as the “mastery approach”: students learn a specific concept in a linear progression before moving to the next more complex subject. Students learn and master fewer mathematical concepts at greater detail using a three-step learning process: concrete, pictorial, and abstract. These are techniques of the teaching methods: to cover fewer topics in greater depth, handling objects such as pencils, dice, or paper clips, pictorial visualisation by drawing diagrams, bar modelling (a pictorial method used to solve arithmetic problems). Bar modelling is far more efficient than the “guess-and-check” approach. A 2015 study of 140 schools in the UK by found that the mastery approach improved the speed at which students learned math skills.
This is how Jeff Bezos, the richest man on the planet teaches maths to his children.
October 8, 2018 Leave a comment
We use math symbols to express complex mathematical texts in a shorter form.
= replaces “is equal to”
+ replaces “and”
× replaces “multiplied by”
. . . .
There are many Greek symbols like π ∑ and special symbols like √ ∞ ∈ in mathematics.
John David Walters explains where math symbols come from in the video:
September 8, 2018 Leave a comment
George Boole (1815–1864)
The term “Boolean algebra” honors George Boole (1815–1864), a self-educated English mathematician. Boolean algebra captures essential properties of both set operations and logic operations. Boolean logic is credited with laying the foundations for the information age (computers and cell phones).
One of the puzzles on Boolean logic:
There are three balls X, Y and Z. They are colored red, white and blue, but not necessarily in this order. One, but only one, of the following statements is true:
X is red
Y is not red
Z is not blue
How many solutions does the puzzle have?
Think yourself before checking the solution.
August 5, 2018 Leave a comment
The picture shows a subway map. A team of inspectors verifies passengers’ tickets at a station on a line, or all lines through it if there are many lines. Then they randomly choose the next neighboring station and move there to make their inspection.
Subway map
How many times higher is the probability of being inspected at station C than at station A?
Are you eager to know the answer? Try yourself before reading how Markov Chain helps to solve the problem. The answer is here.
The perfect explanation is given in the PBS Infinite Series video:
