[1].
Setting up a meal

1.
plus
2.
subtraction
3.
multiply
4.
divide
5.
Mixed calculations (1)
6.
Mixed calculations (2)
7.
Mixed calculations (3)
8.
Mixed calculations (4)
Unit conclusion
Confirm in descriptive form
Take a break

[2].
mixed calculations

1.
Mixed calculation of + and - (1)
2.
Mixed calculation of + and - (2)
3.
Product of three numbers
4.
Calculation order of multiplication formulas
5.
Share and share again
6.
Mixed calculations of x and ÷
7.
Mixed calculations of +, -, x
8.
Mixed calculations of +, -, ÷
9.
Mixed calculations of +, -, x, ÷
Unit conclusion
Confirm in descriptive form
Take a break

[3].
Mixed Calculation Practice

Answers and Explanations

1.
Contains the meaning of operation!

The book “Sentence Concept Comes First” introduces the meaning of each operation.
After introducing situations where each operation is needed, such as situations for addition, situations for subtraction, expressions for multiplication, and situations where division is required, we explain situations where two or more operations are used simultaneously.
Since a calculation formula is a problem situation translated into the language of mathematics, each calculation formula has a meaning for the situation.
You can also look at the formula in reverse to find its original meaning.
If you follow the meaning, you will naturally come to know that there is an order to calculations.
Through “The Concept of Sentence Problems Comes First,” which properly explains the original meaning of operations, we hope you will practice changing sentence problems into formulas and finding the meaning of the calculation formulas.


2.
Develop your ability to think logically!

Mathematics is more than just an activity of calculating or finding answers; it is an activity of logical thinking.
However, in actual educational settings, it is not easy to evaluate the flow of logical thinking.
So most evaluations end up just checking whether the answer is right or wrong.
This type of evaluation method causes mathematics to stray from its essence.
If you know the principles and study them, there is no subject as fun as math.
In particular, reading problems in sentence form and creating equations is an excellent opportunity to train logical thinking in the elementary school curriculum.
It can be said that the activity of logical thinking, reading a problem and creating a correct equation, is closer to the essence of studying mathematics than the activity of calculating quickly and accurately to find the answer without making mistakes.
Experience the true joy of mathematics with "Sentence Concepts Come First"!

3.
The important thing is big! In image!

You might think a book that explains abstract mathematical concepts in a mathematical way would be difficult? Not so! This book explains abstract concepts in a way that's easy for learners to remember.
The content is developed with interesting materials and pictures, and the intensity of the content is effectively expressed so that important information can be seen at a glance.
Discover "Concepts Come First" with its intuitive design that lets you understand concepts at a glance, friendly explanations, and comprehensive problems.

4.
Very, very friendly answer sheet!

Even though we know how to solve a problem, there are more cases than you might think where we make mistakes in calculations.
And sometimes, when you're so absorbed in calculating something, you forget what you were calculating.
Here's a special answer sheet to help you answer all the questions you know.
The entire calculation process is detailed, as if the teacher had solved it by hand, and various clues hidden in the problem are highlighted with colors and arrows, so that you can intuitively know how to use them at which stage.
Take a look at the helpful explanation of "Sentence Concepts Come First" and upgrade your students' calculation skills to the next level.

5.
Free video lectures so you can study on your own!

This book provides video lectures on every concept from beginning to end.
In addition, we provide solution videos for problems that are difficult to solve on your own.
You can view the lectures immediately by scanning the QR codes located at the corners of the page, and you can check out more materials by visiting the Mathbus website (www.mathbus.co.kr), operated directly by Key Publishing.
Have fun studying with a former EBS teacher's cheerful, refreshing, and exhilarating lectures!

★★★ Great for students like this!
* Friends who are good at finding answers, but don't know the concept when asked about it
* Friends who are good at solving problems when they are expressed in a formula, but get lost when they are expressed in a sentence

★★★ A math book worthy of the name!!
Mathematics is often said to be beautiful because it solves problems in a clean and uncluttered way.
Come face to face with problems that will train your logical thinking.

★★★ A book that proves that math books can be pretty too!!!
This math book unfolds mathematical concepts through illustrations and has a pastel-toned layout, reminiscent of a fairy tale.
Add fun to your studies with these pretty math books.