Question 2: The significance of mathematical decimals in the second volume of the fourth grade. (10)
2.5 1× 10= 2.63× 10= 0.645× 1000= 0.03× 100=
4.03÷ 10= 7÷ 100= 63.5÷ 1000= 5.63× 10÷ 100=
0. 1÷ 100= 1.02× 10= 2. 1÷ 1000= 0.56÷ 10× 1000=
Second, I'll fill it out. (20)
1, a decimal consists of (), () and ().
2. The second digit to the left of the decimal point is (), its counting unit is (), the fourth digit is (), and its counting unit is (). The first digit to the right of the decimal point is (), its counting unit is (), and the counting unit of the third digit is ().
3. The decimal 2.05 is pronounced as (), 2 means () and 5 means ().
4. Three 1, five 0. 1 and 1 0.0 1 are written as a decimal ().
The counting unit of 5 and 8.02 is (), and it has () such counting units. The counting unit of 0.256 is (), and it has () such counting units.
6. There are () decimal places greater than 8 and less than 9.
7. Rewrite 168000 into a number with "ten thousand" as the unit (); The mantissa after omitting ten thousand digits is (); Rewrite 995,000,000 yuan into a number () with "100 million yuan" as the unit, and keep one decimal place as ().
8. If the decimal point moves one place to the right, the original number is (), and if it moves two places to the left, the original number is ().
9. Enlarging () times 1.5 is 15, and reducing () times is 0.0 15.
Reducing 0.73 to one tenth of the original is ().
10. Fill in ">", "
0. 18○0. 179 0.50○0.5 0. 1○0.0999
4.954 6.96 6.8 hectares 6 hectares 8 square meters 108 cm 1 decimeter
Thirdly, I will be a judge. (6 points)
1 and decimal are both less than 1. ()
2. Kobayashi's height is11.4m. ()
3,0. 14 Pronunciation: 0.14 ()
4.0. 1 is one tenth of 1 and is 0.0 1 0 times of1. ()
5. Write 6 as 0.06 with two decimal places. ()
6. Add "0" or remove "0" after the decimal point, and the size of the decimal point remains unchanged. ( )
Fourth, I will choose. (5 points)
1, in the following figures, the same size after removing 0 is ().
A, B, C, 4400.
There is a () decimal between 2.0.5 and 0.6.
A, 0 B, 1 C, countless.
3. The closest to 6 is () a, 5.899 B, 6.0 1 C, 6. 1.
4, in 3.2, 3.02, 3.202 is the smallest ()
a、3.02 B、3.2 C、3.202
5. If the decimal point of a decimal number moves two places to the left, the number will be ().
A, expanded to 100 times the original number b, reduced to 100% of the original number.
C, reduced to one hundred percent of the original quantity.
5. Unit conversion. (8 points)
2. 1 yuan = () yuan () min 3.08km = () m.
8 m 6 cm = () cm 0.4 m2 = () cm 2.
2 tons and 20 kilograms = () tons and 0.5 hectares = () square meters.
1:30 = () 260m2 = () hectares
6. Colors indicate the following decimals: (6 points)
0.4 1.5 0.06 m
Seven, write the decimal point pointed by the arrow. (4 points)
Eight, write the number as required. (6 points)
Keep the whole number accurate to the tenth place, and keep two decimal places rounded to thousands.
3.5672
10.092 1
9.9985
Nine, according to the following figures: (10)
1、 0.76、 0.067、 0.706、...& gt& gt
Question 3: Used to express (? )、(? )、(? ) Numbers are decimals (The meaning of decimals in the second volume of Grade Four is used to indicate that (a few tenths), (a few percent) and (a few thousandths) numbers are decimals.
Question 4: The meaning of decimals in grade four and the difference between reading and writing and grade three. (10 point) 2.51×10 = 2.63×10 = 0.645×1000 = 0.03×100 = 4.03 \. 0 ÷100 =1.02x10 = 2.1÷1000 = 0.56 ÷10x/kloc. 2. The second digit to the left of the decimal point is (), its counting unit is (), the fourth digit is (), and its counting unit is (). The first digit to the right of the decimal point is (), its counting unit is (), and the counting unit of the third digit is (). 3. The decimal 2.05 is pronounced as (), 2 means () and 5 means (). 4. Three 1, five 0. 1 and 1 0.0 1 are written as a decimal (). The counting unit of 5 and 8.02 is (), and it has () such counting units. The counting unit of 0.256 is (), and it has () such counting units. 6. There are () decimal places greater than 8 and less than 9. 7. Rewrite 168000 into a number with "ten thousand" as the unit (); The mantissa after omitting ten thousand digits is (); Rewrite 995,000,000 yuan into a number () with "100 million yuan" as the unit, and keep one decimal place as (). 8. If the decimal point moves one place to the right, the original number will be (), and if it moves two places to the left, the original number will be () 9. Enlarge () times 1.5 to 15, and reduce () times to 0.0 15. Reducing 0.73 to one tenth of the original is (). 10. Fill in ">", "
Question 5: What is the significance and nature of the decimal in Unit 4 of Mathematics in the second volume of Grade Four? (10)
2.5 1× 10= 2.63× 10= 0.645× 1000= 0.03× 100=
4.03÷ 10= 7÷ 100= 63.5÷ 1000= 5.63× 10÷ 100=
0. 1÷ 100= 1.02× 10= 2. 1÷ 1000= 0.56÷ 10× 1000=
Second, I'll fill it out. (20)
1, and a decimal consists of (), () and ().
2. The second digit to the left of the decimal point is (), its counting unit is (), the fourth digit is (), and its counting unit is (). The first digit to the right of the decimal point is (), its counting unit is (), and the counting unit of the third digit is ().
3. The decimal 2.05 is pronounced as (), 2 means () and 5 means ().
4. Three 1, five 0. 1 and 1 0.0 1 are written as a decimal ().
The counting unit of 5 and 8.02 is (), and it has () such counting units. The counting unit of 0.256 is (), and it has () such counting units.
6. There are () decimal places greater than 8 and less than 9.
7. Rewrite 168000 into a number with "ten thousand" as the unit (); The mantissa after omitting ten thousand digits is (); Rewrite 995,000,000 yuan into a number () with "100 million yuan" as the unit, and keep one decimal place as ().
8. If the decimal point moves one place to the right, the original number is (); if it moves two places to the left, the original number is ().
9. Enlarging () times 1.5 is 15, and reducing () times is 0.0 15.
Reducing 0.73 to one tenth of the original is ().
10. Fill in ">", "
0. 18○0. 179 0.50○0.5 0. 1○0.0999
4.954 6.96 6.8 hectares 6 hectares 8 square meters 108 cm 1 decimeter
Thirdly, I will be a judge. (6 points)
1 and decimal are both less than 1. ()
2. Kobayashi's height is11.4m. ()
3,0. 14 Pronunciation: 0.14 ()
4.0. 1 is one tenth of 1 and is 0.0 1 0 times of1. ()
5. Write 6 as 0.06 with two decimal places. ()
6. Add "0" or remove "0" after the decimal point, and the size of the decimal point remains unchanged. ( )
Fourth, I will choose. (5 points)
1, in the following figures, the same size after removing 0 is ().
A, B, C, 4400.
There is a () decimal between 2.0.5 and 0.6.
A, 0 B, 1 C, countless.
3, the closest to 6 is ()
a、5.899 B、6.0 1 C、6. 1
4, in 3.2, 3.02, 3.202 is the smallest ()
a、3.02 B、3.2 C、3.202
5. If the decimal point of a decimal number moves two places to the left, the number will be ().
A, expanded to 100 times the original number b, reduced to 100% of the original number.
C, reduced to one hundred percent of the original quantity.
5. Unit conversion. (8 points)
2. 1 yuan = () yuan () min 3.08km = () m.
8 m 6 cm = () cm 0.4 m2 = () cm 2.
2 tons and 20 kilograms = () tons and 0.5 hectares = () square meters.
1:30 = () 260m2 = () hectares
6. Colors indicate the following decimals: (6 points)
0.4 1.5 0.06 m
Seven, write the decimal point pointed by the arrow. (4 points)
Eight, write the number as required. (6 points)
Keep the whole number accurate to the tenth place, and keep two decimal places rounded to thousands.
3.5672
10.092 1
9.9985
Nine, according to the following figures: (10)
1、 0.76、 0.067、 0.706、...& gt& gt
Question 6: The significance of decimal numbers in the fourth grade of primary school. Teacher's teaching plan 1. Writing teaching cases is a way for teachers to constantly reflect and improve their own teaching, which can make teachers more deeply aware of the key and difficult points in their work. This process is the process of teachers' self-education and growth.
2. The process of teachers writing teaching cases is the process of mutual transformation between external education theory and internal teaching theory, which can provide rich practical situations for new teachers and in-service teachers, help to integrate theory with practice in teaching and cultivate the ability to analyze and solve problems.
3. Teaching cases are a true and typical record of teachers' teaching behavior, a true embodiment of teachers' teaching ideas and concepts, a valuable resource for education and teaching research, and an important medium for communication between teachers.