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• M5G - Mathematics 5th grade
• M6G - Mathematics 6th grade
• A7G - Algebra 7th grade
• G7G - Geometry 7th grade
• A8G - Algebra 8th grade
• G8G - Geometry 8th grade
• A9G - Algebra 9th grade
• G9G - Geometry 9th grade
• A10G - Algebra 10th grade
• G10G - Geometry 10th grade
• A11G - Algebra 11th grade
• G11G - Geometry 11th grade
• Calculus, Algebra 1, Algebra 2...

Main course (M5G)
Lesson 1.1: Mathematical Expressions

5th grade is exactly what you want if you want to start from the "absolute" beginning. This is where the basics of the basics are learned. Start building your foundation.

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Quote

"There is no royal way in geometry." — Euclid.

It was an answer to the Egyptian king Ptolemy I, who asked Euclid to show him an easier way to study geometry.

Main course (M5G)
Lesson 1.2: Measuring quantities

In this lesson, various units of measurement are considered - from a barrel to a micromicron, as well as some fundamental concepts from geometry.

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Main course (M5G)
Lesson 1.3: Divisibility of natural numbers

🔢 Exploring Divisibility in Natural Numbers: Unlocking the Patterns within Digits! 🔍

Greetings, math enthusiasts! Are you ready to delve into the fascinating world of divisibility in natural numbers? 🌟

In this captivating post, we'll journey through the intricate realm of divisibility and unlock the hidden patterns that reside within the digits. 💡

Join us as we unravel the secrets of divisibility rules, discovering the relationships between prime numbers, factors, and multiples. Expand your understanding of how numbers interact and gain valuable problem-solving skills along the way. 💪

Whether you're a curious learner, a dedicated math lover, or simply seeking to enhance your numeracy skills, this exploration offers a wealth of knowledge and insights. 🚀

Engage in lively discussions, share your discoveries, and connect with like-minded individuals in our vibrant Telegram channel.

Quote

"He became a poet - for a mathematician he lacked imagination." — David Hilbert.

Indeed, for the creation of something new or its discovery, there is no way further for those who think in a stereotyped way.

The study of mathematics can have various effects on the body, both physical and psychological.

Improving Brain Function: Learning math requires active use of different areas of the brain such as the frontal cortex, hippocampus, and temporal lobes. Regular practice of mathematics can lead to improved memory, concentration, logical thinking, and problem solving.

Reducing Stress: Many people feel anxious and stressed at the thought of math. However, with regular practice of math exercises, this can change. Learning math requires logic and consistency, which can help reduce stress and anxiety levels.

Improving Problem Solving: Mathematics is the science of problem solving. Studying mathematics helps develop the skills to analyze a problem, break it down into simpler parts, and apply logical strategies to find a solution.

Main course (M5G)
Lesson 1.4: Common fractions

In this lesson you will find out about common fractions, numerator, denominator, how to compare, add, multiply fractions etc.

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Interesting fact

Charles Lutwidge Dodgson is a little-known British mathematician who devoted a fair amount of his life to the study of logic. However, he became famous under a different name - Lewis Carroll, author of Alice in Wonderland.

Interesting fact

Banach-Tarski paradox: There is a strange paradox in mathematics known as the Banach-Tarski paradox. He claims that one can take a sphere, break it into several pieces, and with only rotations and shifts, assemble two complete spheres of the same size. This is contrary to common sense, but in mathematics it is possible!

Main course (M6G)
Lesson 1.1: Relations between numbers and quantities

In this lesson you will get acquainted with such concepts as the ratio of numbers, scale. The very important concepts of percentage, direct and inverse proportionality are also clarified. At the end is an interesting comment by Isaac Newton.

Remember, each lesson builds on the previous ones, so I recommend studying them sequentially.

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Interesting fact

The number zero (0) was not recognized as a number in many ancient civilizations. It was introduced to the Western world by the Italian mathematician Fibonacci in the 13th century.

By the way, The Fibonacci sequence is a series of numbers in which each number is the sum of the two preceding ones: 0, 1, 1, 2, 3, 5, 8, 13, 21, and so on. This sequence appears in various natural phenomena, such as the arrangement of leaves on a stem or the spiral pattern of a seashell.

The Four Color Theorem states that any map can be colored using only four colors in such a way that no two adjacent regions have the same color. Although it was first conjectured in the 19th century, it wasn't proven until 1976 with the help of computers.

The four color theorem has been notorious for attracting a large number of false proofs and disproofs in its long history. At first, The New York Times refused, as a matter of policy, to report on the Appel–Haken proof, fearing that the proof would be shown false like the ones before it (Wilson 2014). Some alleged proofs, stood under public scrutiny for over a decade before they were refuted. But many more, authored by amateurs, were never published at all.

Pi (π) is an irrational number: Pi is the ratio of a circle's circumference to its diameter, approximately equal to 3.14159. It is an irrational number, which means it cannot be expressed as a fraction or a finite decimal. Its decimal representation goes on infinitely without repeating.

It's important to understand the origin of this number. This is why: L = 2πR, L – length of the circle and so formulas.

Task

Complexity: ⭐️⭐️⭐️

The last digit in a natural number is 2016 times less than the number itself. Find all tick numbers.

Task

Complexity – ⭐️⭐️⭐️⭐️

A natural number n is called good if each of the numbers n, n + 1, n + 2 and n + 3 is divisible by the sum of its digits. (For example, n = 60398 is good.)
Does a good number ending in 8 necessarily have a 9 as the penultimate digit?

By the way, a number that is divisible by the sum of its digits is called a Harshad number.

Source: Vseross., 2001.

Task

Difficulty – ⭐️⭐️⭐️⭐️

Three digits were written to the right of the natural number A. The resulting number turned out to be equal to the sum of all natural numbers from 1 to A. Find A.

Source: Vseross., 1999.

Main course (M6G)
Lesson 1.2: Whole numbers

In this lesson you will find out about some essential integer properties like: commutative, associative. Also, we represent integers on the coordinate axis here.

Remember, each lesson builds on the previous ones, so I recommend studying them sequentially.

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Use of math

Structural Analysis - the prediction of the response of structures to specified arbitrary external loads. Engineers use mathematical concepts to analyze the strength and stability of structures. They apply principles of statics, mechanics of materials, and structural analysis to calculate forces, stresses, and deformations in buildings, bridges, and other infrastructure.

During the preliminary structural design stage, a structure's potential external load is estimated, and the size of the structure's interconnected members are determined based on the estimated loads.