calculate

408÷ 12=34

Or 12×34=408.

How to calculate the mathematical disjoint algorithm in the first volume of the third grade of primary school? First multiply and divide, then add and subtract.

Parentheses are followed by addition, subtraction, multiplication and division, so count from beginning to end.

Mixed operation of addition, subtraction, multiplication and division, first multiplication and division, then addition and subtraction; Only add, subtract or multiply and divide from left to right. If there are brackets, the calculation in brackets and the calculation outside brackets are disjoint.

How to create life problems and introduce new lessons? For example, how much does it cost to buy a book of 12 yuan for each of the 24 people in the class?

How to do carry multiplication in the third grade of primary school, such as:

12* 12= 144

12

* 12

-

24

12

-

144

80x54 How to check the algorithm of the third grade of primary school 80x54=4320

Check calculation:

4320÷80=54

Or:

4320÷54=80

Urgently ask for 50 multiplication pens in the second volume of the third grade of primary school, quickly! 34×4

45×3

56×2 1

34×4 1

22× 1 1

22×90

56×98

67×76

45×89

43×2 1

23×99

34× 13

42×76

65× 15

25×25

26×26

72×34

33×88

56×98

45× 17

13× 17

12×8 1

1 1×99

9× 12

123×5

34×9 1

19×7

13× 16

13× 125

8×78

9× 17

4×32

23×8 1

2 1×9

12×65

33×88

99×7

32× 12

34×9

12× 12

13× 13

14× 14

15× 15

16×89

17×76

56×9 1

16× 19

12×89

15×9 1

50×89

24×87

24×24

26× 17

14×88

15×65

16×88

17× 17

18× 19

19×3 1

30×98

135×5

135× 15

65× 13

77× 1 1

144× 12

196× 14

256× 16

88×8

72×9

72×2

99×9

186× 12

666× 1 1 1

34× 17

28×4

27×9

32×4

84× 12

125×25

655×5

565×5

752×2

744×2

675× 15

765×5

76×2

344×8

24×3

256×4

234×2

782×4

9 18×9

345× 15

366×6

729×9

62×3 1

93×3

123×3

444×4

1 1 1×3

999×9

65×5

66×2

76×2

How to check the math 305x4 in the third grade of primary school? 305x4= 1220。

Checking calculation: 1220÷4=305.

Or: 1220÷305=4

Kneel down, class 4, unit 6, mathematics, grade three, writing multiplication (continuous carry) blackboard design? So are the students in our class. They always make such mistakes. The teachers in the same group recommended "Excellent Teaching Plan" to me, and made guidance and analysis on these problems. In view of the mistakes made by students, teachers should guide students to check whether there is a carry in each step of calculation, how much is the advance, and record the number of items above the horizontal line in a vertical position. When calculating the product of the previous one, it is necessary to think about whether there is a missing number after it. After the calculation, check it once or twice.

What does carry-free multiplication mean in the third grade of elementary school mathematics?

Such as: 33×2=66

But 33×4 has carry, 3×4= 12, 1 has carry.