Miracle Calculation, Volume 9 [Advanced Addition and Subtraction of Fractions]
Step 81.
Divisors and common divisors, multiples and common multiples
Step 82.
Greatest common divisor and least common multiple
Step 83.
The relationship between common divisors and greatest common divisors, common multiples and least common multiples
Step 84.
abbreviation
Step 85.
Indignation
Step 86.
Addition and subtraction of proper fractions with different denominators
Step 87.
Addition and subtraction of mixed numbers with different denominators ①
Step 88.
Addition and subtraction of mixed numbers with different denominators ②
Step 89.
Comprehensive addition and subtraction of fractions with different denominators
Step 90.
5th grade equations

▶ Just by learning operations, you can completely conquer 80% of elementary math!
Operations are so boring, are you wondering if you really need to do them?
In mathematics, operations are the most basic area.
It occupies the largest portion of the five areas of elementary mathematics, and other areas often require calculations at the end.
If the operation is not sufficiently trained at this time, it is difficult to solve the problem to the end.
Especially as students reach higher grades in elementary school, calculations become increasingly difficult and complex, leading to a lack of time to solve problems and frequent mistakes due to impatience.
If you take this lightly and leave it alone, it can become a major weakness when you become a middle or high school student.
Even though the calculations are easy, it is essential to practice solving them accurately step by step from the beginning.

Start by practicing operations, which are the core of elementary school mathematics.
If you are good at calculations, math becomes fun and you will become more confident and good at math.
If you build a foundation in math through arithmetic training, your child's 'math confidence' will grow rapidly.

▶ Reduce errors and increase speed with one-day iteration design!
When we look at children who struggle with math, those in the lower grades of elementary school often lack calculation skills, while those in the middle grades and above often have poor calculation skills and concepts.
It takes a long time to calculate, so there is not enough time to actually solve the problem, or even after setting up a difficult solution process, you make a mistake in the final simple calculation.
It's not that they don't know how to do it, it's that they're not skilled at performing the procedure, which makes it take a long time and cause malfunctions.
Kill two birds with one stone: accuracy and speed with the "One Day Repeat Design," which involves repeating two types of work, one page per day, for five days straight from "The Miracle Calculation Method."
By repeatedly solving problems of the same difficulty level enough times and training until you become familiar with the calculation algorithm, you can reduce errors and calculate faster and faster.


▶ Todok, tear off one sheet, anytime, anywhere, lightly!
Each page has a cutting line so that you can tear it off and use it individually.
You can study easily by reading as much as you need, anytime, anywhere.
Look at your child's learning pace and amount and adjust it to create study habits.
Each page and each book has a different burden on the child, and if the burden of studying is reduced, it will be easier to develop study habits in the child.
Develop your child's own study habits by consistently solving one page every day.

▶ 200% utilization of problems, even elementary equations!
As you solve problems, you will encounter equations like '□'.
Even if you practice arithmetic sufficiently, you may be flustered when a word problem with □ appears on a school test.
□ It may be unfamiliar and you may be wondering how to solve it.
In the final stage of each volume of “Miracle Calculation Method,” you will practice equations with □ from the basics to word problems all at once.
By training elementary school students in equations using principles that are perfect for them, they can develop the ability to solve problems on their own, from calculations to applications.