Quick Division for Busy 3rd and 4th Graders

Division Diagnostic Assessment

First yard.
Perfect division tables
01.
Let's start warming up for division~
02 Division tables quickly and accurately~
03 Take your division skills to the next level!
04 Complete Comprehensive Problems on Division Tables

Second yard.
(two-digit number)÷(one-digit number)
05 The quotient of division is calculated from the front!
06 Check if you have calculated the quotient and remainder correctly!
07 Find the tens place quotient and be sure to write down the remainder.
08 (two-digit number)÷(one-digit number) comprehensive problem

Third yard.
(three-digit number)÷(one-digit number)
Think of 09 (two-digit number)÷(one-digit number)
10 If it is not divisible, move the quotient one space to the right!
11 Let's compare the divisor and the remainder!
12 No mistakes! (three-digit number)÷(one-digit number) intensive practice
13 (three-digit number)÷(one-digit number) comprehensive problem

Fourth yard.
(two-digit number)÷(two-digit number)
14 The remainder is always less than the divisor!
15 Let's estimate the quotient using multiplication facts!
If you get the quotient wrong, try this!
17 No mistakes! (two-digit number)÷(two-digit number) intensive practice
18 (two-digit number)÷(two-digit number) comprehensive problem

Fifth yard.
(three-digit number)÷(two-digit number)
19 (three-digit number)÷(tens) is easy to calculate~
20 Divide the quotient to the right~ to the right~
21 The position of the quotient changes depending on the divisor.
22 It looks complicated, but it's just like doing division twice!
23 No mistakes! (three-digit number)÷(two-digit number) intensive practice
24 (three-digit number)÷(two-digit number) comprehensive problem

Correct answer

Quick Division for Busy 3rd and 4th Graders

Just quickly reinforce your weak operations! If you're good at multiplication and division, you'll be good at fractions and decimals.

■ The first step to determining math skills: arithmetic operations
80% of elementary math is operations, and the proportion is very high.
However, if the basic calculations are slow when solving math problems, the brain will easily become tired every time you solve a problem.
So, math must be learned perfectly from the four basic arithmetic operations.
Making progress without being good at math is like building a castle on sand.
If you are in the 3rd or 4th grade, you should not only be able to do addition and subtraction, but also multiplication and division, but you should be very proficient at it.
Because arithmetic operations determine future math skills.


■ “Developing thinking skills does not automatically develop computational skills!”
Even the top 1% of students attending academies are trained to perfect their calculation skills, regardless of their progress.
Even the principal who taught a student who won first place in a math competition said, “Computational ability is not something that can be solved automatically by prioritizing math progress or developing thinking skills.
As far as computational ability is concerned, it must be mastered through repeated training.
“Problem-solving skills can only be improved if the calculations are solved first,” says Director Choi Jeong-gyu, who mentored the student who won the grand prize in the Sungkyunkwan University Mathematics Competition.
When multiplication and division are shaky, fraction and decimal calculations fall apart.
Try investing time in operations that don't work.

■ Just like stringing beads to make a necklace, a summary of operations learned in various grades!
Systematic learning must occur within a single operation.
For example, when doing division, if you are not good at even (three-digit number)÷(one-digit number), then when you practice (three-digit number)÷(two-digit number), the operation will inevitably feel very difficult.
Elementary school textbooks cover five areas: 'Numbers and Operations', 'Shapes', 'Measurement', 'Probability and Statistics', and 'Regularity'.
While it is important to study the math curriculum for your grade level, it is most important to focus on operations first.
Because operations affect the rest of mathematics.
If I'm not good at fourth-grade math, should I reread all my first- through third-grade math textbooks? Simply reviewing all of the math is inefficient.
It is necessary to focus on solving the vulnerable operations first.
As the knowledge that was learned piecemeal and forgotten is strung together like beads, your thinking ability is strengthened, and you can solve math problems without any difficulties because you can connect the learned operations to the next operation.

■ Just as snow piles up only when it pours heavily, you need to focus on your studies to build up your skills!
Have you ever seen snow pile up? When it stops snowing, it all melts away, but when it pours down, it piles up on the ground.
The same goes for studying.
If you study little by little, one step at a time every few days, what you learn will not accumulate and will melt away like snow.
If you focus and study hard, your skills will gradually build up.

The 'Busy Operation Method' series consists of two volumes, each with 24 steps.
It is more efficient to solve 1-2 steps per day in 10-20 days than to solve them over several months.
If you focus and study, you will be able to easily understand the overall context, which will reduce the time it takes to solve a single book.
If you immerse yourself in one thing for a short period of time and learn it, you will become proficient in it.


■ It got better thanks to the feedback from teachers and readers!
'Busy Operation' has been republished to reflect the revised curriculum.
In this edition, we have taken into account the feedback from students, parents, and academy teachers who have already solved the 'Busy Operation Method' for several years to further enhance the learning effect.
To this end, we collected about 30 textbooks that students had worked on themselves and identified actual learning patterns, such as how they solved the problems and which parts they frequently made mistakes in.
We also communicated with parents and teachers at the academy about how the child's learning was progressing.
We've compiled the vivid opinions of our readers into a list of 'truly effective methods' and 'directions that provide direct help.'



■ Characteristics of the 'Busy Operation Method'

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 or 20-day progress chart based on the results of the '15-minute diagnostic assessment' included in this book.
If you want a faster diagnosis, you can also check the progress chart that is right for you with the '7-minute diagnostic assessment'.
If you are a 4th grader, even if a 20-day progress chart is provided, we recommend that you focus on completing the calculations by challenging the 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 problems with the teacher using "Busy Tips" and "Oops! Mistakes!"
No more mechanical, uninspired solutions! This revised edition, informed by the opinions of math academy directors, includes helpful tips throughout the book, as if you were right there with a teacher.
From helpful "busy tips" to minimize mistakes, to "Oops! Mistakes" to help you avoid mistakes, this book is packed with calculation tips from the directors of math academies in Daechi-dong, Gangnam, and Ilsan. Even if you're working independently, you'll enjoy the benefits of studying with a friendly teacher.

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 revised edition has a more flexible structure, with steps that require simple practice expanded to 3 pages, and steps that require more practice expanded to 4 or 5 pages, allowing you to learn more efficiently with the same investment of time.
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) As you understand and internalize various issues, your confidence will naturally increase!
It doesn't end with just practicing simple calculation problems.
You can organize concepts by completing easy everyday word problems and thinking problems, practice mixing them up at the end of each section, and even encounter comprehensive problems that conclude in a fun, game-like manner.
These problems are a combination of the word problems and comprehensive problems you'll encounter in school, helping you develop your thinking skills and prepare for descriptive questions.
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!