Phép trừ có nhớ trong phạm vi 1000: Lý thuyết & Bài tập!

Remember within 1000 is the basic knowledge of Grade 2 Math. Because the number is too large, in the process of performing the calculation, the baby is easily wrong. Therefore, in order to help your baby understand and conquer this knowledge effectively, parents, let Mầm non Cát Linh immediately discover the secrets shared shortly.

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Knowledge of remedy with memory within 1000 to master

Here is the knowledge of the elimination with memory within 1000 that elementary school students need to master:

• The concept of subtraction has a memory: Remember the remembrance occurs when the number of deductions is smaller than the number deducted in a row, must “borrow” a unit from the left row.
• Digital structure with three digits: Understand 3 -digit numbers including hundreds, dozens, and units.
• Skills to perform subtraction with vertical columns:
  • Write the subtraction in the vertical column, in line, tens, and hundreds.
  • Perform from right to left: Unit → tens → hundred.
  • If the minus number is larger than the number deducted in 1 row, remember (borrow) 1 unit from the left line.

Types of elimination exercises within 1000 are common memory

For the form of mathematics performing the memory within the range of 1000 will also have the following common types of exercises:

Form 1: Set calculated and calculate

Method of solving: Put the vertical calculation with the numbers in the same line straight together, hundreds of hundreds, dozens of tens of tens and rows of units too. Then except the calculation from right to left. Note that “remember” on the digit at the minus to avoid confusion when performing the calculation.

For example:

Form 2: The problem has words

Solution method: Read and analyze the problem carefully, see which data given in advance, requires what to calculate to find an exact solution. Then present the solution with the calculation and the answer so clear and accurate.

For example: Mr. Tu’s family has a large guava garden, this year harvested 739 kg, including 238 kg of guava, the rest is the queen guava. Ask how many kilograms of Queen’s family harvest queen’s family?

Solution:

Number of kilograms of guava queen = Number of kilograms of Mr. Tu’s family harvested – Number of kilograms of guava.

Detailed solution:

Mr. Tu’s family harvested the number of kilometers of the queen:

739 – 238 = 501 (kg)

Answer: 501 kg

Form 3: Perform memory subtraction calculations within 1000 and compare

Solution: We will also perform calculations in two sides and then compare which number is bigger, which is smaller or equal, to fill out the accurate mark.

Example: Enter the seal>, <, = in the dot

a) 829 – 182> 813 – 289

b) 913 – 679 <891 – 399

c) 719 – 81> 591 – 67

Form 4: Complete the number of numbers evenly

Solution: How many units will we pro

Example: Fill in the appropriate number in the dot

390; 375; …; 345; …; …; 300.

Prize:

We see: 390 – 375 = 15 so this sequence may be a decreasing sequence of 15 units, the following number is smaller than the previous number of 15 units, the previous number is greater than the number after 15 units. So the dots we will fill as follows:

390; 375; 360; 345; 330; 315; 300.

Form 5: Find mistakes and correct calculations

Solution: We will determine the error in the calculation through the calculation, check the results of the calculation or the wrong position, the wrong calculation. After determining the error, the error will correct the error.

Some of the deduction exercises are remembered within 1000 so that the baby will practice

Below Mầm non Cát Linh will summarize some exercises related to the subtraction with memory of grade 2 within the number 1000 so that they can practice:

Difficulties when children learn mathematics within 1000, remember

After understanding the concept of subtraction, we know there will be two forms of subtraction with memory and exorcism without remember. In particular, memory deduction is a more advanced knowledge than not remembering. In particular, performing calculations within 1000 will also make many children more difficult. Because:

• Large numbers: Children will learn knowledge with memory of 2nd grade math, with a large number of up to 1000 so the calculation number will be more, so when performing the calculation is prone to errors.

• The ability to think limited: When performing the remedy with memory with the types of exercises with solutions, because the ability to think many children is limited, it is difficult to be allowed to calculate and perform accurately.

• Babies do not understand the rules of calculation, memory: “When in the same row where the number of deductions is smaller than the subtraction, we have to borrow 1 in the next row to subtract. In return, when approaching the next unit, we add 1 in the subtraction number in the following row.”However, many babies have not grasped this rule, so they often follow the elimination without remember.

• Diverse exercises: With knowledge from grade 2 in terms of subtraction, there will be many different types of exercises from mental calculation, calculation and calculation, comparison, … so many babies will have difficulty solving exercises if they do not understand the lesson.

The secret to helping children learn to be memorized within 1000 effectively

To help children learn, remember and solve math exercises except for memory within 1000 effect, parents can immediately apply the following tips:

Building a mathematical foundation for children from an early age with Mầm non Cát Linh Math

In fact, the calculation of except memory is a basic knowledge that if the child does not master, when solving exercises or doing more advanced exercises will be difficult to effectively. Therefore, it is important to create a solid baby early.

In addition to studying in class, if parents do not have much time to study with children, they can immediately refer to Mầm non Cát Linh Math. This is an application for online English thinking for preschool and elementary school children developed by Mầm non Cát Linh, in order to build a mathematical platform and develop thinking for children in the golden period of 3 – 8 years old.

The interesting point when children learn math with Mầm non Cát Linh Math is to learn through videos, funny animations and interactive games instead of just learning on books. Specifically, the application is built with more than 400 video lessons based on over 60 topics of 7 major math problems such as calculation, counting, comparison, measurement … thereby helping children absorb and comprehend knowledge in a more positive method, helping children understand the nature of each math instead of just learning parrots.

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Parents can learn more about Mầm non Cát Linh Math through the following video:

Help children understand the rules, the nature of the elimination memory

In order to learn to remember within 1000, parents need to help children understand the nature of this calculation. Specifically, When performing the subtraction, remember in order from right to left, but in the same row of deductions smaller than the number except we will have to borrow 1 in the next row to subtract (remember 1). Until when performing the subtraction in the next row we add 1 in the minus to calculate.

Parents need to explain, as an example, instructions in detail by step by step so that their children really understand what “remember” here? Especially, when learning math with Mầm non Cát Linh Math based on vivid illustration videos will help children understand more easily that parents can refer.

Learning math exclusion has basic to advanced

In order to ensure that the baby acquires knowledge effectively, as well as not under pressure when learning math parents should let their children learn knowledge from basic and then improve. Specifically, let your baby practice the elimination without remember, then remember but within the small number from 10 to 100 and then 1000.

Because when you first understand the memory, you will do exercises within 1000 children, it will easily feel too much and difficult to solve the exercise. Just like when doing homework, should go from easy exercises such as calculating and calculating, calculating and then more advanced exercises such as finding rules, solving mathematics with words, … This will help your baby easily acquire knowledge and practice more effectively.

Practice your baby regularly

When your child has mastered the theory of memory except within 1000, parents should create conditions for children to practice and practice regularly.

The practice here may come from the same child’s exercise in textbooks, refer to many new knowledge on the Internet, organize math games, organize small competitions on mathematics for children to participate and have bonuses, … When children practice more, they will increase their ability to acquire knowledge, as well as create interest for children when learning math, this is very good for the development of children’s mathematics thinking.

Practice reading skills carefully before solving exercises

With the mathematical problem with the 2nd grade within 1000 quite large, along with many different types of exercises, parents need to request and guide their children to read the problem carefully before doing. Because in mathematics, if only one number or a calculation, the result of the whole problem will be wrong.

Some notes when parents teach children to learn mathematics

To help the process of teaching children to learn math exclusion effectively, parents should note some of the following issues:

• Always accompanying children: With this knowledge is quite difficult, many types of exercises, parents need to accompany children to guide their children to learn, answer when they are difficult to understand, as well as consider their learning ability to offer appropriate solutions.

• Creating comfort when children learn math: Instead of imposing children to do the exact exercise, focus on the score, making them pressure and fear of learning math. Instead, it should be comfortable for children with many different learning methods such as games, math problems, puzzles, …

• Regularly talk to teachers about children’s learning capacity: In order to make a learning plan suitable for children, parents should talk to teachers about their ability to learn and absorb more often in class.

With the knowledge of mathematics with memory within 1000 is one of the important foundations when learning math that your child needs to master. Therefore, parents should accompany, support and apply the above secrets and methods of Mầm non Cát Linh to help their children’s study achieve the best results.