Dạy bé học toán lớp 4 phép trừ: Cách tính và các dạng bài tập thường gặp

Subtraction is one of the basic types of math in grade 4 but is very important throughout the math learning process of young children. Therefore, to help children learn subtraction well in grade 4 math, Nguyễn Tất Thành will clearly state the theory, types of exercises and some good study tips in this article. Teachers and parents can also refer to it to guide children to learn more easily.

Theory of math subtraction grade 4

Subtraction is one of four basic mathematical operations, including: addition, subtraction, multiplication, and division. This is the calculation to reduce the existing value to get the final value, denoted by the “-” sign.

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A subtraction operation will be denoted as: a – b = c.

In there:

• a is the number to be subtracted (i.e. the value taken away)

• b is the minus number (ie the value to be taken)

• c is the difference (ie the remaining value after taking the subtracted number)

Besides, when studying subtraction in the 4th grade math textbook, you need to remember that there are two types: subtraction without memory and subtraction with memory.

How to do math subtraction for grade 4

In the 4th grade math textbook Subtraction, students will learn how to perform calculations of subtraction with memory and subtraction without memory. You need to understand how to calculate correctly as follows:

Subtraction without remembering is a very simple math operation, easy to perform. When solving 4th grade math without remembering, we perform the calculation from right to left in each row with the subtracted number being larger than the subtracted number.

For example: 55 – 20 = 35

In there:

• Number 55: Called the subtracted number.

• Number 20: Called the minus number.

• Number 35: The result of subtraction is called difference.

Compared to subtraction without memory, subtraction with memory is more advanced but is still performed in order from right to left. But in the same row the number to be subtracted is smaller than the subtracted number, we must borrow 1 from the next row to subtract (remember 1). We continue to perform the subtraction calculation in the next row, needing to add 1 to the subtraction number to calculate.

For example: 45 – 17 = ?

• Units place: 5 cannot subtract 7, subtract 7 from 15 to equal 8, write 8 and remember 1.
• Tens: 1 plus 1 equals 2, 4 minus 2 equals 2, write 2. The result is 28.

Common types of math exercises for grade 4 subtraction

When studying and practicing the 4th grade subtraction math book, you will encounter a number of exercises such as: calculating and then calculating, finding x, calculating the value of an expression or solving word problems with text,… In the section This time, Nguyễn Tất Thành will guide you how to solve each type of problem so that you can easily complete solving 4th grade math exercises, subtraction in textbooks, workbooks or other important exam questions,…

Form 1: Calculate then calculate

It can be said that calculating and calculating is a very popular form of 4-subtraction math. To do this exercise, you need to put the calculation in a vertical line and calculate. Specifically:

• Write the subtracted number below the subtracted number so that it lines up in a straight column.

• Subtract natural numbers in order from right to left. Units, hundreds, thousands,…

• Review the results and conclusions.

For example: Set and then calculate:

1. 7363 – 4052 = ?

2. 36582 – 14270 = ?

Answer:

Form 2: Find x

For example: Find x and know: x – 5 = 30

To solve this 4th grade subtraction and x problem, we need to determine the role of x to apply the rules to solve.

• To find the subtracted number, we take the difference between addition and subtraction.

• To find the subtraction number, we take the subtracted number and subtract the difference.

Based on that, we can solve the above example exercise as follows:

We have: x – 5 = 30

=> x = 35 + 5

=> x = 40

Form 3: Calculate the expression value

For example:

1. 1478 – 174 x 8

2. 478 – 356 + 429 : 3

The method to solve this exercise is to apply the rules of calculation including:

• Expressions with parentheses are evaluated within the previous parentheses and outside the following parentheses.

• If the expression has addition, subtraction, multiplication, and division operations, we perform the multiplication and division operations first; Perform addition and subtraction calculations after…

• If expressions have only addition and subtraction or only multiplication and division, we calculate them from left to right.

• Check the results again and draw conclusions.

Based on the method of solving 4th grade subtraction problems above, we can calculate the value of the expression in the example above as follows:

1. 1478 – 174 x 8 = 1478 – (174 x 8) = 1478 – 1392 = 86

2. 478 – 356 + 429 : 3 = 478 – 356 + 143 = 265

Type 4: Solve math problems with text

For example: A store sold 790 kg of rice in 2 days. On the first day, the store sold 480 kg of rice. How many kilograms of rice did the store sell on Monday?

The method to solve this exercise should be as follows:

• Step 1: Read carefully the requirements of the problem to determine the components and calculations that need to be performed.

• Step 2: Present the solution and perform the calculation.

• Step 3: Check the results and conclusions.

From there, we can solve the above example exercise as follows:

On day 2, the store sold a total of kg of rice:

790 – 480 = 310 (kg rice)

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Answer: On the second day, the store sold 310 kg of rice.

Some 4th grade math exercises on subtraction for students to practice

Through the above section of understanding the 4th grade math theory of subtraction, students should practice the exercises to remember knowledge and improve their test-taking skills. Below are some 4th grade math subtraction exercises for you to practice:

Method to help children solve 4th grade subtraction problems easily

In general, the 4th grade math subtraction lesson is also very simple. However, if you do not remember the solution method of exercises related to subtraction, it will be very difficult to do the exercises. Below are some “good tips” to help you complete the exercises easily.

Memorize 4th grade math theory subtraction lesson

Basically, 4th grade subtraction math problems have many types of exercises and calculation formulas. Maybe that’s why many students will easily forget the theory, leading to not knowing how to solve subtraction exercises. To avoid the situation of not knowing how to solve math exercises with 4 subtractions, parents need to remind and guide children to remember and understand the subtraction formulas.

To remember the theories, the first thing children need to do is focus on studying in class to understand the lesson. Next, you should systematize the theory and write it down on paper many times to remember it more deeply. At the same time, it is necessary to combine it with regular homework to apply theory into practice.

Master the solving steps of each type of exercise

As stated above, subtraction exercises for grade 4 include 4 common types of exercises. For each type of problem there is a different solution method. Therefore, you need to remember the characteristics and steps to solve the exercises so that you can do them easily. Parents should remind their children to do the homework in the correct order and not to jump around when doing the homework to avoid confusion. At the same time, you can also review the problem to find errors if you have solved it incorrectly.

Summary of topic

Before taking the test, you need to carefully read the question’s requirements and analyze the content to find the best solution. When analyzing content, parents should guide children to take the additional step of summarizing the topic in the form of short sentences, numbers or diagrams. The data are written concisely and will help students understand the math problem more easily, avoiding being deceived by the “tips” in the lesson and confusing the data. From there, it will be easier for children to solve those exercises.

Regularly practice 4th grade subtraction math problems

One of the effective ways to learn subtraction in 4th grade math is to practice the exercises regularly. Parents can let children do exercises in textbooks, workbooks, or advanced workbooks, exam questions, etc. This is not only a way to help children remember theory and practice working skills. exercises but also contributes to improving calculation skills. When faced with more difficult test questions, children will easily recognize which type of exercise to solve.

Learn from mistakes

When solving math exercises in general and 4th grade math subtraction in particular, solving the exercises with incorrect results is also unavoidable. At that time, parents should not scold their children too much to avoid making them afraid and affecting their psychology. Instead, parents should help their children realize where their mistakes are and how to fix them. This way, children will remember their mistakes and learn from them for future exercises.

Group study

Concentration when studying or doing anything is very important to bring good results. However, that is not the reason why parents force their children to sit and study attentively alone in a corner. Instead, parents can let their children study in groups of about 3-4 people. Because each person will have a different idea and way of solving the problem, thanks to that, children will learn many different ways of solving. In particular, this learning method also helps children enjoy and love this rather dry Math subject more.

Practice self-discipline in studying

Not only with Math but with any subject, if children are forced to study, they will not like it and will not be able to concentrate on studying well. Therefore, parents should train their children to be self-disciplined in learning by: creating a comfortable learning environment, reminding their children to study on time, encouraging their children’s learning spirit (rewarding and giving gifts to their children). When you finish studying, solve the exercises correctly,…). Besides, parents also need to explain to their children the importance of studying, so that they gradually become aware of self-discipline when studying.

Consolidate your knowledge and practice math with Nguyễn Tất Thành Math

In addition to the above learning methods, Nguyễn Tất Thành Math is a learning application that helps children practice their skills in solving 4th grade math problems, subtraction and other types of exercises very effectively. Because this is a teaching application that closely follows the new GDT program for Preschool and Primary school children. The lessons are divided into more than 60 topics under 7 major mathematical topics to help children easily grasp mathematical concepts such as:

• Counting and Gathering Numbers

• Calculus and Algebraic Thinking

• Decimal Numbers and Calculations

• Measurement

• Geometry

• Space and Time

• Data and Graphs

Depending on the age and level of each child, Nguyễn Tất Thành Math divides appropriate learning paths for each level from easy to difficult. Furthermore, the content of the lessons is organized according to games, videos, and images that are very lively and attractive. This helps stimulate children’s interest in learning and makes it easier to remember mathematical knowledge.

Furthermore, Nguyễn Tất Thành Math also combines teaching in English. Therefore, when learning this learning application, children not only consolidate their Math knowledge and improve their thinking ability, but also contribute to helping children develop better language. If your child has not yet learned this application, parents should download the Nguyễn Tất Thành Math app on their phone, iPad or computer so that their child can access knowledge early.

Video introducing Nguyễn Tất Thành Math application.

In short, through this article, Nguyễn Tất Thành has helped students clearly understand the formula for calculating 4th grade math subtraction. Hopefully this will help you learn Math better. In addition, parents should not forget to remind their children to study the Nguyễn Tất Thành Math application and follow many other useful lectures at the website monkey.edu.vn every day.

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