Tổng hợp 30+ bài tập tìm x lớp 2 và kinh nghiệm học hay cho bé

Grade 2 math finding x is one of the types of exercises that children will get acquainted with, learn and practice. But this type of math will require quite a high level of thinking, so to help your child learn this knowledge well, parents should try to apply the following tips and practice the following exercises with your child.

What is math for finding x in grade 2?

Grade 2 x-finding math is known as a form of math based on rules to find unknown components of addition, subtraction, multiplication, and division.

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For example: Find x, know:

X + 7 = 15

=> x = 15 – 7 = 8

=> x = 8

Some difficulties when children learn math to find x in grade 2

For grade 2 math, finding x, children often encounter some difficulties that lead to not understanding the lesson or making incorrect calculations such as:

• Not understanding calculations clearly: With math, finding x is a type of exercise that appears in all four operations: addition, subtraction, multiplication, and division. If you do not clearly know how to calculate these calculations, finding x will easily be 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 exact result x. So if your child cannot reason, it will be difficult to solve the exercises.

• Not reading the problem carefully: In mathematics, even the wrong sign of a calculation will lead to wrong results, so many children do not read the problem carefully, as if they change the side without changing the sign, they will break the math rule of finding x.

Types of math to find x for grade 2 and solution methods

In the grade 2 math program, children will be introduced to the following forms of math to find x from basic to advanced:

Basic math format for finding x for grade 2

Solution method:

We will rely on the rule to find the unknown component of the 2nd layer x-finding calculations of multiplication, division, addition, and subtraction, respectively as follows:

• Addition: x + b = c or a + x = c. The rule for finding x will be: Term = sum – term
• Subtraction: x – b = c or a – x = c. The rule for finding x would be: Subtracted number = difference + subtracted number or subtracted number = subtracted number – difference
• Multiplication: xxb = c or axx = c. The rule for finding x will be: Factor = product: factor
• Division: x : b = c or a : x = c. The rule for finding x will be: dividend = quotient x divisor or divisor = dividend : quotient.

For example:

a) X + 12 = 36 – 20

b) X – 24 = 58 – 11

c) X : 4 = 48 – 47

d) X x 3 = 12 + 3

Advanced grade 2 math format for finding x

With this advanced grade 2 math format, the problem will have many calculations combined together to find x. To solve, you will also move the x side to the other side, at the same time change the sign and perform the corresponding calculation.

In addition, with advanced math, there are also grade 2 math exercises with text solutions. Requires students to read the lesson carefully to analyze the existing problem data and requirements to solve the problem correctly.

For example: (x + 1) + (x – 3) +( x + 5) = 30

Or Find a number that when you add that number to 12 it equals 43

Tips for teaching math to find x effectively for grade 2 children

For grade 2 math finding x, there will be many different types of exercises, as well as quite important and difficult knowledge. Therefore, to help children improve their learning efficiency, parents can apply some of the tips that timhieulichsuquancaugiay.edu.vn shares below.

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Helps children master addition, subtraction, multiplication, and division

To learn 2nd grade math to find x accurately, children must first calculate exact calculations. Usually, 2nd graders will only learn calculations within 100, mostly knowledge of addition and subtraction.

Therefore, parents need to make sure their children can calculate sharp and accurate addition and subtraction calculations, as well as the multiplication and division multiplication table, to be able to solve the problem of finding x accurately. To do this, parents should test their children's knowledge regularly, or ask calculation questions to see their child's calculation ability to reinforce knowledge in a timely manner.

Practice regularly with your baby

Once your child has firmly grasped the theory, parents should create conditions for them to practice more often. Practice can come from doing exercises assigned in class with your child, experiencing activities on timhieulichsuquancaugiay.edu.vn Math, organizing related games,…

The fact that children practice regularly will help them remember knowledge better, as well as gain interest and develop their thinking ability when learning math more effectively.

Refer to many 2nd grade math exercises to find x on the internet

Instead of just letting your child study and solve exercises on the textbooks assigned by teachers, parents should consult with their children and learn more exercises related to math, finding x, grade 2, addition, subtraction, multiplication and division. With the strong development of technology today, there is a lot of knowledge on the internet for parents and children to refer to, learn and practice.

Try your hand at many forms of advanced math

To promote children's math ability, parents should try letting their children conquer advanced 2nd grade math to see what their child's ability is instead of just doing basic math. At the same time, this method will help parents know their children's learning ability, thereby providing the best way to teach and consolidate their children's knowledge.

Some math exercises to find x for grade 2 for children to practice on their own (with answers)

To improve the effectiveness of learning math in grade 2 with exercises to find x, here are some exercises for your child to practice:

Lesson 1: Find x and know

a) x + 12 = 46

b) 42 + x = 87

c) x + 26 = 12 + 17

d) 34 + x = 86 – 21

Answer:

a) x = 34

b) x = 45

c) x = 3

d) x = 31

Lesson 2: Find x and know

a) x – 17 = 23

b) x – 15 = 21 + 49

c) x – 34 = 67 – 49

Answer:

a) x = 40

b) x = 85

c) x = 52

Lesson 3: Find x and know

a) 17 – x = 12

b) 72 + 12 – x = 48

c) 28 + 26 – x = 67 – 39

Answer:

a) x = 5

b) x = 36

c) x = 26

Lesson 4: Find what you know

a) y – 56 = 56 – y

b) 48 – y = 48 + y

Answer:

a) y = 56

b) y = 0

Lesson 5: Find a number that when you add that number to 32, it equals 57

-> The number to find is 25.

Lesson 6: Find a number knowing that the quotient of that number with 5 is the quotient of 54 and 5

-> The number to find is 54.

Lesson 7: Find a number knowing that subtracting that number from the largest two-digit number will yield the smallest two-digit number

-> The number to find is 89.

Lesson 8: Find a number knowing that adding that number to 20 will give you the difference between the largest two-digit number and the smallest two-digit number.

-> The number to find is 69.

Lesson 9: Find a number knowing that when you subtract the product of 5 and 3 from that number, you get 55

-> The number to find is 70.

Lesson 10: Find a number whose difference with 54 is equal to the largest one-digit number

-> The number to find is 63.

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Lesson 11: Find a number knowing that subtracting that number from 73 will yield the smallest two-digit number

-> The number to find is 63.

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

-> The number to find is 41.

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

a) x

b) x + 13

c) 12 – 7

d) 1 + x > 8

Answer:

a) xx is number 1 or 2

b) xx is number 1 or 2

c) 5 x is the number 6 or 7

d) x > 7 -> x is the number 8 or 9

Lesson 14: Fill in >,

a, x + 32 ………41 + x

b, 56 – x ………45 – x

c, x – 26 ……….x – 18

d, 52 – 47 ………52 – 47 – x

e, 42 + 21 + x……..42 + 21

g, 29 + 42 – x …….42 + 29 + x

Answer:

a, x + 32

b, 56 – x > 45 – x

c, x – 26

d, 52 – 47 = 52 – 47 – x

e, 42 + 21 + x = 42 + 21

g, 29 + 42 – x

Lesson 15: Find x

a, 14 – x = 14 – 2

b, 52 + 4 > x + 52

c, 46

d, 13 – 7

Answer:

a) x = 2

b) x

c) 91

d) 6

Lesson 16: Find x

a, 10 + x

b, x – 8

Answer:

a) x

b) x

Lesson 17: Find x

a, x

b, x + 13

c, 12 – 7

Answer:

a) x

b) x

c) 5

Lesson 18: Find the number x knowing:

a, 35x

b, 207 > x70

c, 199

Answer:

a, x are numbers 0 or 1

b, x are numbers 1

c, Can be any three-digit number from 200 to 299

Lesson 19: Find x

a, x + 20

b, 46

Answer:

a) x

b) 91

Lesson 20: Find Y

a, y – 65 = 65 – y

b, 84 – y = 84 + y

Answer:

a) y = 0

b) y = 0

Lesson 21: Find x (Practice yourself)

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 Medicine (Self-practice)

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 (Self-practice)

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 (Self-practice)

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

Lesson 25: Find x (Practice yourself)

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 (Practice yourself)

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

b, X – 21 = 33 -21 65 – X = 48 + 17

Lesson 27: Problem of finding what you know (Self-practice)

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

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

Lesson 28: Find x (Practice yourself)

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 by subtracting the largest one-digit number from that number, you will get the number immediately following the largest two-digit round number. (Self-practice)

Lesson 30: Find a number knowing that adding that number to 40 and then subtracting 30 will give you 20. (Practice yourself)

Lesson 31: Find a number knowing that adding that number to 32 gives the result 20 + 16. (Practice yourself)

Conclude

Math to find x for grade 2 is a type of exercise not only found in grade 2 but also in most older grades, and the knowledge will be even more difficult. Therefore, parents need to guide their children to master this knowledge early, to help them achieve good results in learning and apply it in solving related problems most effectively.

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