Recommendation
To begin with

[Warm-up]

① Cherry calculation method - addition operation with two-digit + one-digit carry
② Cherry calculation method - addition operation with three-digit + two-digit carry

Let's start gift mental arithmetic!

STEP 1.
Let's send a 'gift'
STEP 2.
Add and subtract as many gifts as you send
STEP 3.
Let's multiply the numbers we added and subtracted
STEP 4.
Let's multiply the digits of the units
STEP 5. Combine STEP 3 and STEP 4 to complete.
STEP 6.
Let's adapt to the gift mental arithmetic method
STEP 7.
Let's speed up the calculation by reducing the number of steps.
STEP 8.
Let's perfectly master the gift mental arithmetic.

Final Test of Gift Mental Calculation

Gift Mental Calculation 10-Question Note Test ①
Gift Mental Calculation 10-Question Note Test ②
Gift Mental Calculation 10-Question Note Test ③
Gift Mental Calculation 10-Question Note Test ④
Gift Mental Calculation 10-Question Note Test ⑤
Gift Mental Calculation 20-Question Comprehensive Test ①
Gift Mental Calculation 20-Question Comprehensive Test ②
Gift Mental Calculation 20-Question Comprehensive Test ③

[Secrets to High Scores in Math]

①Two-digit number x one-digit number is easy to solve using the distributive law, and 19 x 19 is easy to solve using the futures mental arithmetic method!
② Speed ​​up decimal calculations and ratio calculations with the gift mental arithmetic method!
③You can calculate the area, volume, and even angles of shapes using the gift mental arithmetic method!

supplement

The Trick of Gift Calculation Revealed
Correct answer
Gift Mental Calculation Completion Certificate

The first textbook to connect Haruki Murakami and Pokémon to become a top 3 “comprehensive bestseller”!
The Korean edition of "Cancer Walk," the hot topic that shook up the Japanese publishing industry in 2023, is now available!

An unusual book has garnered significant attention by ranking high on the comprehensive bestseller list for the first half of 2023 (compiled from November 22, 2022 to May 20, 2023) released by Japan's largest publishing distributors, Nippon Publishing and TOHAN.
The book that proudly achieved the third place in the comprehensive bestseller ranking is none other than the children's learning book known as "Amsanwalk," and this is an unprecedented record in the Japanese publishing industry for a children's learning book to be ranked in the comprehensive ranking.

This book, published in early December 2022 and having sold over 460,000 copies as of June 2023, is a brain training book for adults as well as elementary school students, its main target audience. Word of mouth has spread and its readership has expanded significantly, and it is still very popular in Japan.


This popular book has been translated and published in Korea under the title “Mental Calculation Genius: Miraculous 19-Stage Multiplication.”
By taking advantage of the original book's unique features, this book introduces a friendly mental arithmetic method that allows you to solve multiplication problems between two-digit numbers with a tens place of 10 in just 5 seconds, using only mental calculations in your head, without paper or pencil.
Let's hurry and check out that book that "children can figure out the solution on their own," that book that "really made it possible to do mental calculations up to the 19th dan," and that book that "instilled confidence in math"!

19th level, now stop memorizing and do 'mental calculation'!

No matter what field of study you are in, if your foundation is not solid, you cannot reach higher levels.
Among these, the reality is that in mathematics, if you do not have the basic operations of addition, subtraction, multiplication, and division, you cannot even think about solving problems that require high-level mathematical thinking skills.
Operations are so important that they are called the 'flower of elementary school mathematics'. This is because in reality, most elementary school math tests are designed to determine scores based on 'how quickly and without mistakes one can find the correct answer'.

In particular, the multiplication tables, which are the basis of multiplication, are important and useful formulas that can be used throughout one's life once memorized.
However, asking children who have already mastered the multiplication table to memorize up to the 19th table is just a shortcut to making them distance themselves from math.
Is it really necessary to force yourself to memorize up to 19 levels?

"Mental Calculation Genius: Miracle 19-Stage Multiplication" reveals the secret to solving 19-stage multiplication problems quickly and accurately using mental calculation instead of memorization.
This book helps anyone who knows the multiplication tables, even elementary school students, to quickly solve 19×19 in their head in just one day.
If you know this mental arithmetic method, you no longer need a pencil and paper.
Without having to rewrite the problem in a vertical calculation in a corner of a notebook to do the math, you can get the answer much faster and more accurately than before, using only mental calculations in your head!

The Secret of the "Gift Mental Arithmetic" Method That Will Boost Your Math Skills

The mental arithmetic method introduced in 『Mental Calculation Genius: Miracle 19-Stage Multiplication』 is so easy and simple that at first glance, you might suspect it is a trick or a fraud.
However, this mental arithmetic method is based on mathematical laws, and was created by a famous mathematics instructor who graduated from the Department of Economics at the University of Tokyo so that anyone can easily understand and acquire it.


What is easily obtained is also easily lost.
So, the author of this book divided the steps into 8 stages so that you can fully master this mental arithmetic method and design it so that you can practice it sufficiently.
And for those who have mastered the 'gift mental arithmetic' step by step, starting with sending a 'gift', we did not forget to provide a note test and comprehensive test so that they can check their own skills and hone their skills further.

So, what's the secret behind this "gift mental arithmetic"? Let's explore and discover it for ourselves as we follow the steps.
Approaching a given problem with this kind of thinking rather than just solving it without thinking will help you develop your mathematical skills.
At the end of the book, the author explains the secrets of this mental arithmetic method with pictures at an elementary school level, so let's compare it with my hypothesis.
This book opens your eyes to see the same numbers differently, awakens your dormant math brain, and provides an opportunity to gain fun and confidence in math.

Anyone, regardless of age or gender, can become a mental arithmetic genius in just one day!

This method, which allows you to mentally calculate from 11×11 to 19×19 in just 5 seconds, can also be applied to multiplying decimal points, calculating the area, volume, and angles of shapes, which you will learn in the elementary school math curriculum.
It solves problems such as lack of time on the test and increases the accuracy of the answers because it allows you to get answers much faster and more accurately than calculating with a pencil.

The magical multiplication techniques featured in this book aren't just useful for elementary school students.
Not only is it effective in waking up the dulled brains of adults who easily resort to calculators even for simple calculations, but it is also especially good for people who frequently experience brain fog, a side effect of COVID-19, or the elderly who are concerned about dementia.
Studying mathematics, which requires 'active thinking', is highly effective in preventing dementia by activating the brain's cognitive and information processing functions.
Moreover, double-digit multiplication problems require not only memory but also calculation skills, so they will add vitality to your increasingly dull brain.
Let's all become mental math geniuses with "The Miraculous 19-Stage Multiplication Method: A Mental Math Genius," a book that benefits people of all ages! As the author suggests, perhaps the time will come when everyone around the world can mentally calculate up to 19 times.