# Ryosuke University

## Order of Operations: The Rules of the Four Arithmetic Operations in Elementary Math

There are rules when doing math in elementary school. You cannot do the calculations any way you like. There are rules for calculations, and you have to follow the order of the rules. In elementary arithmetic, what are the rules when doing calculations? One of the most important rules is that multiplication and division should […]

## Division and Remainders: Long Division in Elementary Math

After learning multiplication, we will study integer division in elementary school arithmetic. 1, 2, 3, etc., are integers, and we use these numbers to do calculations. The meaning of division is the same as multiplication. In other words, if you can’t do multiplication, you can’t do division. Understand that division is an advanced problem of […]

## Multiplication of Integers: Long Multiplication in Elementary Arithmetic

In elementary school arithmetic, we learn multiplication. Multiplication is used frequently in our daily lives. If you can’t do multiplication, you can’t calculate money when shopping. Therefore, it is necessary to be able to do multiplication. So how can we do multiplication? First of all, you need to understand the meaning of multiplication. We also […]

## Addition and Subtraction: Arithmetic of Carrying and Borrowing

In elementary school mathematics, we learn addition and subtraction. When studying addition and subtraction, a difficult calculation is carrying. Similarly, in subtraction, many elementary school students have difficulty understanding the calculation of borrowing. When adding or subtracting integers, an important number is 10. By finding the number 10, you will be able to calculate carry […]

## Inscribed Angle Theorem: Central Angle and Arc Length

One of the areas studied in mathematics is the inscribed angle. An angle using a circle is an inscribed angle, and by using the properties of the inscribed angle, we can calculate the angle. There are properties of inscribed angles, which is called the inscribed angle theorem. If you do not understand the theorem, you […]

## Pythagorean Theorem: Formulas and Calculation Methods

One of the things we learn in mathematics is the Pythagorean theorem. Even if there is a side with an unknown length, you can use the Pythagorean theorem to calculate its length. In order to understand the Pythagorean theorem, you need to have already learned about square roots. As long as you understand square roots, […]

## Midpoint Theorem and Similarity: Proofs, Converse, and Parallelogram Relationships

We will learn about similarities in mathematics. One of the important things in the field of similarity is the midpoint theorem (or midpoint connector theorem). By using the midpoints of a triangle, we can calculate the side lengths. In addition to triangles, we can also calculate the side lengths of trapezoids and prove parallelograms. The […]

## Triangle Similarity in Math: Similarity Theorems, Proof and Similarity Ratio

A genre studied in mathematics is similarity. Similarity is frequently given as a problem in figures. In similarity problems, there are proof problems and calculation problems. Therefore, we need to learn the conditions under which figures are similar. Not only that, but you should be able to find the side lengths using similar figures. In […]

## Parallelogram Definition, Theorem (Property) and Proof Problems

One of the problems that are given in mathematics is proof. You have to prove that the figures of triangles are equal. In this case, parallelograms are often used in proofs. You will almost never be asked to prove that a shape is a parallelogram. On the other hand, problems that require you to prove […]

## Properties of Isosceles and Right Triangles: Congruence Theorems and Proof Problems

In mathematics, there are two types of shapes that we learn about: isosceles triangles and right triangles. The isosceles triangle and the right triangle are special triangles. Since they are special triangles, they have their own characteristics. By learning what characteristics they have, we will be able to calculate angles and prove shapes. Isosceles triangles […]