First yard.
three digits

01.
Write and read hundreds and hundreds of times
02.
Writing and reading three-digit numbers
03.
The values ​​represented by the numbers are different depending on the position!
04.
Count by 1, 10, 100
05.
Count by 1, 10, 100
06.
Let's compare the digits in order, starting from the hundreds place.
07.
Find the larger and smaller numbers
08.
Three-digit calculations in daily life
First yard passage problem

Second yard.
addition

09.
What if the sum of the digits in the units place is 10 or greater than 10?
10.
The number carried over from the ones place to the tens place!
11.
The secret to solving crossword puzzles easily
12.
The number you carry over must be added to the tens digit!
13.
Don't forget to carry the number up to the higher digit!
14.
The 10 that was carried over is written as 1 in the tens place!
15.
The secret to horizontal multiplication is to write the number you carry over in smaller letters and add them.
16.
Don't forget to add the numbers you carried over!
17.
The number carried over from the tens place goes to the hundreds place!
18.
Addition practice up to the hundreds place
19.
The secret to adding up to the hundreds place
20.
Addition with carry to the hundreds place
21.
Addition with two carry-overs
22.
One more addition with two carryovers!
23.
A secret to faster calculations
24.
No mistakes! Focus on double-digit addition practice.
25.
One more double-digit addition!
26.
How to add tens and hundreds
27.
How to add by dividing by tens and hundreds
28.
How to make and add dozens
29.
Addition in daily life
Second yard passage problem

Third yard.
subtraction

30.
If you can't subtract the digits of the units, round down.
31.
The 1 in the tens place is the 10 in the ones place
32.
The secret to subtraction with retraction
33.
If you round down, the tens digit decreases by 1!
34.
Subtraction of two-digit numbers with borrowing
35.
One more two-digit subtraction with borrowing!
36.
A secret to faster calculations
37.
No mistakes! Intensive subtraction practice with reversal
38.
Be sure to display the remaining number after rounding down
39.
How to divide and subtract by tens and hundreds
40.
How to subtract by making the units digit the same
41.
How to make and subtract tens
42.
Subtraction in daily life
Third yard passage problem

Fourth yard.
Calculating three numbers, the relationship between addition and subtraction

43.
Addition of three numbers is done by adding two numbers at a time!
44.
When subtracting three numbers, always start from the front!
45.
Even if addition and subtraction are mixed, always start from the front!
46.
Intensive practice of calculating three numbers
47.
Addition and subtraction are very close!
48.
When expressed as a subtraction formula, the largest number comes first!
49.
When you add two small numbers, you get a big number!
50.
Change the addition equation into a subtraction equation to find the answer
51.
Finding the value of □ in addition formulas
52.
Find the answer by expressing it as an addition or subtraction formula|
53.
Finding the value of □ in a subtraction expression
54.
Calculating three numbers in daily life, the relationship between addition and subtraction
Fourth yard passage problem

Fifth yard.
multiplication

55.
It's easier to count them in groups than to count them one by one!
56.
Simplifying expressions that are added multiple times
57.
Look at the picture and express it as addition and multiplication formulas.
58.
Expressing addition as multiplication
59.
Expressing as addition and multiplication
60.
Multiplication in daily life
Fifth yard passage problem

The first math book to create study habits!
All the calculations you need for this semester are covered in this book!
Busy Textbook Operations 2-1

This semester's math problems can be solved without difficulty by taking small steps!

'Busy Textbook Calculation' is a 'school progress-tailored calculation book' that collects only the calculations needed for this semester and trains them in a smart way.
It explains things the way you would learn in a real school, and the problems are laid out in small steps so you can solve them without getting stuck.
Here are some great tips to help you understand and reduce mistakes! With the "busy tips" you'd only hear from math academy directors and the helpful hints provided throughout the book, you'll easily understand and solve problems.

This book's clever devices will help you focus your attention when you're distracted!

In 'Busy Textbook Operations', operation problems where digits are important have been edited to be calculated accurately on a grid.
Also, problems that second-grade students frequently make mistakes on are reviewed again in the "Oops! Mistake" corner, allowing them to learn faster and more thoroughly.
And there's a target clock on each side with a concentration time written on it.
This watch is not meant to urge you to speed up.
The time given is enough for a second grader to solve the problem without doing anything else.
Try to time yourself so you don't get distracted while studying.
You will experience the fun of concentration and a sense of accomplishment at the same time.

A book that touched moms - "This is the first workbook my child has ever finished!"

This book is perfect for kids who haven't yet developed good study habits! Parents who've used "Busy Textbook Calculation" for the past five years have left impressive reviews, including, "This is the workbook my child chose himself," "This is the first book he's ever finished!" and "My child, who used to hate math, says this book is fun and wants to do it again!" These are just a few of the many touching reviews that describe this book as a powerful tool for solidifying children's study habits.
After solving this book, you will feel more confident in class and on unit tests because you have already solved the math textbook.
Experience the joy of seeing your math skills soar with computational training tailored to the new curriculum!

Study 'Busy Textbook Calculation' like this!

Step 1 | Essential Concept Summary: We've carefully selected only the core concepts from math textbooks!
First, you can review the key concepts you need to know for each yard, then check if you have understood the concepts correctly with the 'Quiz'.

Step 2 | Systematic Operational Training: Build your skills step by step, taking small steps.
There are no problems that suddenly jump in difficulty, so you can solve them on your own! Be sure to check out the "Computation Tips" collected from math academy directors across the country! You'll be able to solve them smoothly without any difficulties.
The "Oops! Mistake" section, which contains only the problems that second-year students frequently get wrong, is a great place to go for those problems that you're prone to making mistakes on.

Step 3 | Bonus Problems: Develop your math skills with basic word problems and fun calculation activities!
You can build a foundation for descriptive writing with 'Basic Sentence Problems in Daily Life' and develop your mathematical application and thinking skills with 'fun calculation activities' such as drawing and connecting lines.

Step 4 | Passing Problems by Yard: If you can solve the passing problems, you're done studying this yard operation!
It's time to check your progress with the "Pass Problems" to see if you can wrap up this lesson! If you get any questions wrong, check the relevant section and try again! It's even more effective to review before taking the unit assessment.

A word from a parent who experienced 'Busy Textbook Calculation' in advance!

The first workbook I ever completed was 'Busy Textbook Math'.
The child was very proud after solving it all.
- Busy reader 'Daebaktakpul'

This is a textbook that my son and I chose together so that we could work through one page a day.
My child solves the problems without any burden.
-Busy reader 'ereum1034'

As soon as the child saw it, he said, “This is it!” and sat down to solve it.
I like it very much.
-Busy reader 'Sweet Len'