# Tìm hiểu Tổng hợp 30+ bài tập toán lớp 2 tìm x và kinh nghiệm học hay cho bé mới nhất tháng

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## What is 2nd grade math finding x?

The math of finding x in class 2 is known as a form of math based on the rule of finding the unknown components of addition, subtraction, multiplication, and division operations.

Example: Find x, know:

X + 7 = 15

=> x = 15 – 7 = 8

=> x = 8

## Some difficulties when children learn 2nd grade math find x

For the math form of finding x in grade 2, students often face some difficulties leading to not understanding the lesson, making calculation errors such as:

• Do not understand calculations: In math, finding x is a type of exercise that appears all 4 operations of addition, subtraction, multiplication, and division. If you do not know how to calculate these calculations, finding x will be very easy to go wrong.

• Children’s thinking ability is not high: Math to find x is a form of thinking math, requiring children to find the rules of the problem to find the correct x. Therefore, if they cannot reason, it will be very difficult to solve the exercises.

• Did not read the topic carefully: In math, just putting the wrong sign of the calculation will also lead to the wrong result, so many children do not read the question carefully because changing the sign will not change the math rules to find x.

## Types of maths to find x in class 2 and solution methods

In the 2nd grade math program, children will be familiar with the following types of maths to find x from basic to advanced: ### 2nd grade math form find basic x

Solution method: We will rely on the rule to find the unknown components of the corresponding calculations as follows:

• Addition: x + b = c or a + x = c. The rule to find x would be: Term = sum – term
• Subtraction: x – b = c or a – x ​​= c. The rule to find x would be: Subtracted number = difference + subtraction or subtraction = subtracted number – difference
• Multiplication: xxb = c or axx = c. The rule to find x will be: Factor = product : factor
• Division: x : b = c or a : x = c. The rule to find x would be: divisor = quotient x divisor or divisor = divisor : quotient.
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For example:

a) X + 12 = 36 – 20

b) X – 24 = 58 – 11

c) X : 4 = 48 – 47

e) X x 3 = 12 + 3

With this form of math for finding x in class 2, the problem will have many combinations to find x. Solution, you will also proceed to move the x side to the other side, and at the same time will change the sign and perform the corresponding calculation.

In addition, with advanced math, there are forms of grade 2 math exercises with solutions. Ask them to read carefully to analyze the data of the existing problem, ask them to solve the problem correctly.

Or Find the number that when adding 12 gives 43

### Equip children with basic math knowledge with BINH THANH Math High School

BINH THANH Math High School is known as one of the applications that teach mental arithmetic in English for preschool to primary school children trusted by millions of parents. In particular, this application will teach children to learn math based on many different methods, making dry math lessons more colorful and interesting. Special:

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BINH THANH High School Math. (Photo: Baby Monkey)” >

Along with that, BINH THANH Math High School builds more than 10,000 interactive activities such as games, puzzles, discovering math treasures, etc. for children to practice more. This helps children know how to apply math knowledge in practice, training to develop better mathematical thinking instead of solving conventional math.

### Help children master the knowledge of addition, subtraction, multiplication, and division

To learn 2nd grade math to find x exactly requires the child to correctly calculate the calculations first. Usually, 2nd graders will usually only learn calculations within 100, where most of it is addition, subtraction, multiplication, and division knowledge.

Therefore, parents need to ensure that their children can calculate addition, subtraction, multiplication and division of the multiplication table quickly and accurately to be able to solve the problem of finding x correctly. To do this, parents should regularly check their child’s knowledge, or ask math questions to see how their child’s calculation ability is to reinforce knowledge in time.

### Practice with your baby often

Once your child has mastered the theory, create conditions for him to practice more often. Practice can come from doing homework with your child, experiencing activities on BINH THANH Math High School, organizing related games, etc.

It is the regular practice of children that will help them remember knowledge better, as well as have interest and develop thinking ability when learning math more effectively. ### Refer to many math exercises to find x in grade 2 online

Instead of just letting children learn and solve exercises on textbooks assigned by teachers, parents should consult with their children and learn more related exercises. With the strong development of technology today, there is a lot of knowledge on the internet for parents and children to refer, learn and practice.

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To promote children’s ability to learn math, parents should try to let their children conquer advanced forms of 2nd grade math to see how far their child’s ability is instead of just doing basic math. At the same time, with this method, parents will know how the child’s receptive ability is, thereby giving the best way to teach to reinforce knowledge for children. ## Some math problems to find x in grade 2 for kids to practice

To improve the learning efficiency of 2nd grade Math with the exercise to find x, here are some exercises for your child to practice:

Lesson 1: Find x know

a) x + 12 = 46

b) 42 + x = 87

c) x + 26 = 12 + 17

d) 34 + x = 86 – 21

Lesson 2: Find x know

a) x – 17 = 23

b) x – 15 = 21 + 49

c) x – 34 = 67 – 49

Lesson 3: Find x know

a) 17 – x = 12

b) 72 + 12 – x = 48

c) 28 + 26 – x = 67 – 39

Lesson 4: Find me to know

a) y + 56 = 56 – y

b) 48 – y = 48 + y

Exercise 5: Find a number knowing that if you add it to 32, you get 57

Lesson 6: Find a number whose quotient 5 is the quotient of 54 and 5

Exercise 7: Find a number knowing that subtracting the largest two-digit number is the smallest two-digit number.

Exercise 8: Find a number knowing that when it is added to 20, the difference between the largest two-digit number and the smallest two-digit number.

Lesson 9: Find a number knowing that subtracting the product of 5 and 3 gives 55

Lesson 10: Find the number whose sum of the largest single-digit number is 54

Lesson 11: Find a number knowing that minus 73 gives the smallest two-digit number

Lesson 12: Find a number knowing that if you add 15, you get 56

Lesson 13: Find x is a known 1-digit number

a) x

b) x + 13

c) 12 – 7

dd) 1 + x > 8

Lesson 14: Put the sign >,

a, x + 32 …………41 + x

b, 56 – x …………45 – x

c, x–26 ………….x–18

d, 52 – 47 …………52 – 47 – x

dd, 42 + 21 + x……..42 + 21

g, 29 + 42 – x…….42 + 29 + x

Lesson 15: Find x

a, 14 – x = 14 – 2

b, 52 + 4 > x + 52

c, 46

d, 13 – 7

Lesson 16: Find x

a, 10 + x

b, x – 8

Lesson 17: Find x

a, x

b,x + 13

c, 12 – 7

Lesson 18: Find the digit x knows:

a, 35x

b, 207 > x70

c, 199

Lesson 19: Find x

a, x + 20

b, 46

Lesson 20: Finding Y

a, y + 56 = 56 – y

b, 48 – y = 48 + y

c, 9 xy = 7 xy

Lesson 21: Find x

a, 28 + 26 – x = 67 – 39 x – 34 = 67 – 49

b, 17 – x = 23 – 9 72 + 62 – x = 78

c, x + 36 = 22 + 37 6 x X x 1 = 46 – 10

Lesson 22: Finding Y

a, y + 112 + 143 = 999 – 102 y + 12 + 14 = 48 + 52

b, y – 12 = 45 + 37 68 – y = 27 – 19

c, 15 + 16 – y = 56 72 + 12 – y = 48

Lesson 23: Find a

a, 100 – a = 5 x 9 5 x 7 + a = 100

b, 962 – a = 869 – 28 a – 123 = 400 + 56

c, 45 + 47 – a = 59 + 9 a – 26 = 75 – 17

Lesson 24: Find a

a, a – 105 = 475 – 152 237 + a = 154 + 325

b.325 – 105 + a = 574 156 + 651 – a = 504

c, 276 + 654 – a = 350 455 – 205 + a = 784

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Lesson 25: Find x

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a, X : 3 = 24 : 4 2 x 2 x X = 40

b, 4 x X x 2 = 24 3 x X x 2 = 6 x 6

Lesson 26: Find x

a, 170 – X = 46 + 48 65 + 59 + X = 179

b, X – 21 = 33 -21 65 – X = 48 + 17

Lesson 27: The problem of finding y knows

a, 123 – y = 456 – 345 y + 345 = 657 + 170

b, y – 112 + 12 = 574 y – 231 = 405 + 15

Lesson 28: Find x

a, X + 25 = 100 – 25 700 – X = 300 + 200

b, X + 125 = 100 + 125 X – 48 = 65 – 28

Lesson 29: Find a number knowing that subtracting the largest one-digit number from that number, the next number is the largest two-digit round number.

Lesson 30: Find a number knowing that adding 40 and then subtracting 30 gives 20

Lesson 31: Find a number that adds 32 to get 20 + 16

## Conclude

2nd grade math finding x is the kind of exercise not only grade 2 but most of the big classes will have, even knowledge will be more difficult. Therefore, parents need to orient their children to study so that they can firmly grasp these knowledge from a young age, help them achieve good results in learning and apply them to solve related problems effectively. best.

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