Quick Mixed Whole Number Calculations for Busy Elementary School Students

Diagnostic assessment of mixed calculations of natural numbers
First yard.
Mixed calculations of natural numbers without parentheses
01 Expressions that mix addition and subtraction start from the front!
02 From the front, a mixed equation of multiplication and division!
03 In equations that involve addition, subtraction, and multiplication, multiplication comes first!
04 For equations that mix addition, subtraction, and division, divide first!
05 Multiplication and division come before addition and subtraction!
06 Comprehensive problem on mixed calculations of natural numbers without parentheses
07 Mixed calculation word problems with natural numbers without parentheses

Second yard.
Mixed calculations of natural numbers with parentheses
08 ( ) First! Addition and subtraction from the front
09 ( ) first! Multiplication and division from the front
10 ( ) first! Multiplication comes before addition or subtraction!
11 ( ) first! Division comes before addition and subtraction!
12. For complex esophagus, always calculate ( ) first.
13 ( ) first! Then calculate { }
14 Comprehensive problem on mixed calculations of natural numbers with parentheses
15 Mixed calculation word problems with natural numbers in parentheses

Third yard.
Developing the ability to apply mixed calculations of natural numbers
16 When expressing it as a single equation, let's start by finding the common factor!
17 If you just follow the promise and set the meal properly, half the problem is solved.
18. In places where the calculation order changes, enclose them in ( ).
19 When inserting operation symbols, check subtraction and division first.
20 When calculating a number, calculate the quantifiable part first.
21 The larger the number you multiply or add, the larger the result of the calculation. Answer and solution

Quick Mixed Natural Numbers for Busy Elementary School Students

Confidence in upper grade math
Solidify your 'mixed calculations of natural numbers'!
The secret of a math academy famous for teaching well: intensive training focused on mixed calculations!

■ Why do we need to focus on mixed calculations separately? ‘Mixed calculations of natural numbers’ in the 5th grade first semester math textbook is a unit that requires focused practice, like ‘multiplication tables’.
For friends who are accustomed to calculating from the front, 'mixed calculations with various operation symbols' require a process of memorizing the calculation order and becoming proficient through sufficient practice.
So, math academies in Daechi-dong say that they create a separate workbook containing only mixed calculation problems during vacation and provide intensive training.
This book is a comprehensive training book that covers the core of upper-grade mathematics, 'mixed calculations of natural numbers'.
Before solving a problem, you can easily understand the concept with friendly explanations, and with sufficient computational training, you can challenge yourself with gradually increasing difficulty.
Additionally, you can prepare for school exams by covering everything from applied problems to representative sentence problems that are sure to appear on the exam.
Complete the concepts of mixed natural number calculations and practical applications with this one book, 'Quick Mixed Natural Number Calculations for Busy Elementary School Students'!

■ The 'lump calculation method' of the 'busy calculation method' that catches mixed calculation mistakes Even if you know the calculation order for 'mixed calculation of natural numbers', if you only think about it in your head, it is easy to make the mistake of calculating the part that is easy to calculate mentally first when solving a problem.

This book presents and focuses on the secret to catching mistakes in mixed calculations by first grouping the parts to be solved into chunks.
For example, in an expression where addition and subtraction are mixed with multiplication, the multiplication part is grouped together and then calculated.

This secret is a teaching tip from Dr. Hosara, who has been teaching gifted children at the Bundang Gifted Love Education Research Institute for 17 years.
By grouping them into chunks, long equations are simply transformed into equations that mix additions and subtractions, so long equations become less intimidating and you can catch mistakes in the order of calculations!

■ The secret to being good at middle school math, 'Mixed calculations of natural numbers' The 'Integers and rational numbers' unit, which is studied in middle school, covers mixed calculations with a wider range of numbers than the 'Mixed calculations of natural numbers' learned in the 5th grade of elementary school.
Also, the 'linear equation' that we will learn next is also a concept that is based on the four basic arithmetic operations.
Therefore, it is more important to understand and overcome this part in the later years of elementary school than to do the prerequisites.
If you have a solid grasp of the 'Mixed Calculations of Natural Numbers' unit in elementary school, middle school math will also become easier, right?

■ An efficient learning method that builds real skills through flexible training! 'Quick Mixed Calculations of Natural Numbers for Busy Elementary School Students' is structured so that students can become proficient in 'mixed calculations of natural numbers' rather than just able to solve them through short-term, flexible training, suggesting a more efficient learning method that builds real skills even in the same amount of time.
Steps that require simple practice can be quickly checked and passed over, and steps that require more learning are expanded and structured to allow for sufficient training.
Additionally, it is structured so that you can study intensively in a short period of time by solving 2-3 levels per day within 10-20 days.
If you study intensively, you can easily understand the overall context, which reduces the time it takes to complete a book, and like snow that piles up when you pour it down, your skills will gradually build up.
If you focus on practicing the 'Mixed Calculations of Natural Numbers' section of this book, you will be able to finish elementary school math wisely and become good at middle school math.
■ Features of this book

1) Just 10 days to shape your math life! Customized learning is available at home after a diagnostic assessment!
We applied the actual diagnostic assessment methods of math academy directors to accurately diagnose your child's current learning status and create a customized learning plan even at home.
You can choose to study using either the 10-day progress chart or the 20-day progress chart based on the results of the '10-minute diagnostic assessment' included in this book.
If you want a quicker diagnosis, you can also check the progress chart that is right for you with the '5-minute diagnostic assessment'.

If you are a 6th grader, even if a 20-day progress chart is provided, we recommend that you focus on completing the calculations by challenging yourself with a 10-day progress chart.
Just 10 days to address your learning deficits will be a crucial turning point that will determine your future math career.


2) Don't solve it unconditionally! Look at the concept and 'get the feeling~'
If you solve problems without properly understanding the concepts, you may hit a wall at some point.
Just as you need to consume a balanced diet to build basic physical strength, you need to learn concepts and principles during the training process to build a healthy foundation.

Unlike training books that only contain calculations, Busy Operation Method includes 'concepts at a glance' for each lesson.
It is helpful for friends who are learning on their own, as it allows them to understand the principles and practice calculations through friendly concept explanations that can be understood just by looking at the title.

3) The teacher in the book! Solve the puzzle with the teacher using Padok's 'Honey Tips' and 'Wait! Quiz'!
No more mechanical, uninspired problem-solving! From useful tips to error-reducing tricks, this book offers easy-to-understand and easy-to-follow instructions.
After learning a concept, you can review it again with a "Quiz" so you can enjoy the benefits of studying with a friendly teacher even if you solve it on your own.

4) Scientific learning design! Baboo's "small steps" method builds skills!
No more mechanical, repetitive calculations! We've structured it so you can quickly learn the easy parts and practice more on the more challenging ones.
The more flexible structure allows you to learn more efficiently with the same investment of time, with stages that require simple practice expanded to 3 pages and stages that require more practice expanded to 4 or 5 pages.
Additionally, the level of immersion has been further increased by designing the stages meticulously and scientifically using the 'small step' method of Busy, which gradually increases the level and challenges.
It doesn't suddenly become difficult, so anyone can immerse themselves in it until the end and build their skills.

5) Understand the language of daily life and make it your own, and you will gain confidence naturally!
It doesn't end with just practicing simple calculation problems.
You can prepare for descriptive problems that you will definitely encounter in school, and also develop your thinking skills with fun arithmetic playground problems that are like games.
This book is not just about calculations, but it is more than just a book about calculations, and it helps you develop the problem-solving and creative convergence skills required by the current curriculum!

“Just as snow piles up only when it pours heavily,
“You have to focus on your studies to build your skills.”
Textbook writing professor, gifted education research institute, math academy,
The "Busy Calculation Method" Highly Recommended by Renowned Instructors

The 'Busy Operation' series is a systematically structured book that helps students acquire mathematical procedures through understanding mathematical concepts.
Professor Kim Jin-ho (elementary school mathematics textbook writer)

It's a good structure for students to 'rush to see the end' by systematically arranging calculations in one area.
It will take your calculation speed and accuracy to the next level.
―Director Kim Jong-myeong (GTG Math Center, Bundang)

This is the best textbook for quickly improving your computational skills, as it includes friendly concept explanations and problem-solving tips.
Highly recommended for upperclassmen who lack a solid foundation in mathematics.
―Director Jeong Gyeong-i (Sky Education Moonrae Academy)

Mixed calculations with natural numbers are a unit that requires accuracy and in which children often make calculation mistakes.
Any student who studies with this book will never make a mistake in mixed calculations again.
I highly recommend the 'Busy Operation Method', which will help you gain interest and confidence in math!
―Director Park Ji-hyeon (Daechi-dong Hyeonsu Academy)

Mixed calculations are such an important subject that they are taught separately at academies for over a month.
This book is composed of an appropriate number of problems for children, helping them learn the principles and enjoy calculations.
By the end of this book, you will be a PhD in mixed computation.
Director Han Jeong-woo (Ilsan It's Math)

Mixed calculus is a core concept in upper grades mathematics and a foundational concept in middle school mathematics.
However, since there are no books that cover the subject sufficiently, I have seen many teachers who have created their own materials by simply extracting mixed calculations from the problem bank.
Now this book will save you the trouble!
─Kim Seung-tae (author of "Mathematical Stories Told by Mathematicians")

The reason mixed calculations are difficult is often because we don't see the big picture.
This book is a smart textbook that helps children understand the flow from calculation to application and find answers by organizing the traffic in their minds.
Director Kim Min-kyung (Dongtan The One Math)

This is a complete elementary math textbook! To successfully solve practical problems, mixed math skills are essential.
This is a really necessary textbook for friends who have had a hard time with long meals.
After finishing this book, you won't be afraid of long meals anymore!
─Mr. Nam Shin-hye (Seoul Academy)