First yard · Mixed calculation of natural numbers
01 Expressions that mix addition and subtraction start from the front!
02 From the front, where multiplication and division are mixed!
03 In equations that involve addition, subtraction, and multiplication, multiplication comes first!
04 ( ) First! Multiplication comes before addition or subtraction!
05 In equations that involve addition, subtraction, and division, divide first!
06 ( ) First! Division comes before addition and subtraction!
07 Multiplication and division first! Addition and subtraction later.
08 For complex esophagus, always calculate ( ) first.
09 Complete the mixed calculation of natural numbers perfectly
10 Operations in Daily Life - Mixed Calculations of Natural Numbers

Second yard · water and drainage
11 A factor is a number that divides another number.
You can also find the divisor using the 12 multiplication formula.
13 multiples are the number that is multiplied by a number
14 Dividing into multiples and divisors!
15. Learn about common divisors and the greatest common divisor.
16 The greatest common divisor is the product of numbers that have something in common!
17 Divide until the only common divisor of the two numbers is 1.
18 One more practice of finding the greatest common divisor!
19 Learn about common multiples and least common multiples
20 Let's multiply the remaining numbers by the common product.
21 The least common multiple is the product of the common divisor and the remainder!
22 One more practice of finding the least common multiple!
23 Operations in Daily Life - Factors and Multiples

Third Yard: Abbreviation and Common Name
Multiply by 24 to make a fraction of the same size
Divide by 25 to make equal fractions
26 Fractions become simpler when you simplify them.
27 A fraction that cannot be reduced any further is an irreducible fraction!
28 Using the product of two denominators, the common denominator becomes faster.
29 The number becomes simpler when the least common multiple of the two denominators is common.
30 When comparing the sizes of fractions with different denominators, first compare the common denominators!
31 Compare fractions in pairs
Let's compare the 32 fractions one by one.
33 Comparing the sizes of fractions and decimals
34 Operations in Daily Life - Reduction and Common Fraction

Fourth Yard: Addition and Subtraction of Fractions
35 If the denominators are different, make them common and then add them.
36 If the result of the calculation is an improper fraction, change it to an improper number.
37 After common denominator, add natural numbers and fractions.
If the sum of 38 fractions is an improper fraction, change it to an improper fraction.
39 You also need to practice adding mixed numbers to improper fractions.
One more practice of converting 40 fractions into improper fractions and adding them!
41 Intensive Practice on Adding Fractions with Carrying
42 Complete addition of fractions with different denominators
43 If the denominators are different, make them common and then subtract them.
44 After making a common denominator, subtract natural numbers and fractions.
Let's change 1 from the natural number part to an improper fraction and subtract it.
46 It is also necessary to practice subtracting mixed numbers by converting them to improper fractions.
47 One more practice of converting mixed numbers into improper fractions and subtracting them!
48 Intensive practice of subtracting fractions with regrouping
49 Complete subtraction of fractions with different denominators
50 Operations in Daily Life - Addition and Subtraction of Fractions

Fifth Courtyard · Perimeter and Area of ​​Polygons
51 The perimeter of a regular polygon is the product of the length of one side and the number of sides.
52 The perimeter of a square is twice the sum of the lengths of its two sides.
53 The area of ​​a rectangle is the product of the lengths of its two sides.
54 The area of ​​a parallelogram is the product of the base and the height.
55 The area of ​​a triangle is half the product of the base and the height.
56 The area of ​​a rhombus is half the product of the lengths of its two diagonals.
57 To find the area of ​​a trapezoid, first find the two sides and the height.
58 Operations in Daily Life - Perimeter and Area of ​​Polygons

Quick Textbook Math for Busy Fifth Graders, Semester 5-1
Even if I study less, I get faster? Why is that?

One, the second math textbook that covers all the calculations you need for this semester!

'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.
I explained it in a way that was appropriate for my grade level, the way it was taught in real school, and I arranged the problems to be solved step by step in small steps.
It contains all the units that require training, such as 'Perimeter and Area of ​​Polygons' as well as the four basic arithmetic operations.


These days, there are many complaints on the Internet asking, “Why are the order of the math books different from the textbook?”
The most recently revised fifth grade textbook came out in 2019.
'Busy Textbook Operations' is a true 'operations book aligned with the latest revised curriculum' published after reviewing the 2019 textbook.
If you want to link to your course, make sure it matches the latest revised textbook.

If you solve this book like a textbook supplement and then go to school, not only will you have a high repetition learning effect, but it will also be advantageous for school exams.
Experience the joy of your math skills soaring with the help of calculations based on the new textbooks that have just been released!

Two, friends, complete the math mistakes you often make with intensive training!

Just as eating nutritious food is good for your health, quality is more important than quantity in studying.
Rather than repeating operations at a level I am already familiar with, I build my skills by strengthening operations that I am weak in.
So, this book builds on the fundamentals of calculations and then focuses on only the calculations that fifth graders frequently make mistakes on.
This is because I am more likely to get the same questions wrong as my peers.
In the 'Oops! Mistakes' corner, we've collected the problems that fifth graders frequently get wrong.

You can also review your weaker problems again through the separate section where you can write down the 'problems I was confused about'.
By training like this, you can definitely reduce calculation errors even with a short study time.
You can enjoy the same effect as solving it for 15 minutes by solving it for 5 minutes!

Third, with the math academy's calculation tips, you can see with your own eyes how much faster you are!
Instead of teaching children the secrets of speeding up calculations, existing calculation books often make them solve a huge amount of problems, which often makes children bored with calculations.
This book is packed with calculation tips from the heads of math academies, so you can see your speed improve immediately as you solve problems using this book.
Even if you train a small amount, the calculations become faster!

Fourth, the amazing effects of a goal clock! It increases focus and fills you with a sense of accomplishment.

This book has a clock with target times on each page.
This watch is not meant to urge you to speed up.
The suggested target time is the time that an average 5th grader can solve it without doing anything else.

If you solve it within the target time, check the smiling face on the clock, and if you don't, check the frowning face.
This math book will have children solving the puzzles with more concentration, as if they were playing a game, checking only the smiling faces.


“What? You want to solve one more problem?”
This is a magical math book that will have children solving one more page on their own.
When you feel a sense of accomplishment, you want to solve it again.

This goal clock can also be used for review purposes.
After you finish solving this book, if you copy only the pages where you colored in the frowning faces into a separate workbook and solve them once more, you will be able to strengthen your personalized calculation skills by finishing it in one book without having to solve any other calculation books.


Bonus: a heartwarming math book to help you learn without struggling alone!

In addition to these four effects, 'Busy Textbook Operations' is full of encouragement and praise that boost children's self-esteem.
In place of parents who might be stingy with praise, the puppy character in the book, Busydog, praises the children by saying, “You’ve come this far, that’s amazing!” and whispers tips on how to solve the problem quickly and where mistakes are easy to make as the children solve the book together.
Additionally, the unit concludes with 'Sentence Problems in Daily Life' and the delicious arithmetic activity 'Honey Rice Cake! Arithmetic Snack', providing an opportunity to break away from mechanical arithmetic.


This book not only provides computational training, but also provides an experience of effective study methods and a study environment.
Witness the positive butterfly effect of "Quick Textbook Math for Busy Fifth Graders," a math training book created with children in mind!