First, I can do it! (***36 points)
1, oral calculation (12 points)
3.6÷ 1.2= 0.72÷0.9= 2.6÷ 13= 4.8÷0.4=
4.4÷4= 0.78÷6= 7.2÷0.4= 1÷0.25=
5.5÷ 1 1= 3÷8= 0. 18÷2= 5.6÷ 1.4=
2, vertical calculation (9 points)
1.25÷0.25= 78.6÷ 1 1= 5.63÷7.8=
Decimal representation of business cycle (with two decimal places reserved)
3. Calculation of parting (15)
9.07-22.78÷3.4 1.05÷0.7+ 18.9 2 1.5÷0.05×0.96
0.4×5÷0.4×5 (7.5-2.3×0.4)÷0.0 1
Second, I can fill it out correctly. (***22 points)
1, when calculating 19.76÷0.26, it should be calculated as () ÷ (), using the property of ().
2. The product of two factors is 0.45, one of which is 1.2 and the other is ().
3, 9.9898 ... is a decimal (), and it is recorded as () in a simple way.
4.20÷3' s business simplified method is marked as () and its accuracy is ().
5. Fill the circle with ">" and ".
1.377÷0.99 ○ 1.337 1.377÷ 1.9 ○ 1.377
2.85÷0.6 ○ 2.85×0.6 3.76×0.8 ○ 0.8×3.76
6、 1.2×( )=0.48 ( )×0.34=2.38 27.6=( )×0.46
7. In 3.8484, 3.8484 …, 3.8444 …, 3.84235 …,
The finite decimal is (); There is an infinite decimal (); There are () recurring decimals.
8. Miss Li bought prizes for the students who won the math contest. She bought 12 pens for 148.8 yuan, and each pen was () yuan.
9. After retaining one decimal place, the two decimal places are 1.5. These two decimal places are (), the minimum value is (), and the difference between them is ().
10. After moving the decimal point of a number two places to the right, the number obtained is larger than the original number 19.8, and the original number is ().
Three, I am a judge (***5 points)
1, infinite decimal is greater than finite decimal. ( )
2.4.83÷0.7, 48.3÷7 and 483 ÷70 have equal quotients. ( )
The period of 3.3.54545454 is 54. ( )
4. Similarity numbers 4.2 and 4.20 are the same in size and accuracy. ( )
5. In the division formula with remainder, the dividend and divisor are enlarged by 100 times, and the quotient remains unchanged, so does the remainder. ( )
Fourth, the arrangement of text questions. (***6 points)
① 12.5 times the quotient of 0.32 divided by 0.4, ②7.5 minus 1.5 minus 8. 1 plus.
What is the product? What is the sum and quotient of 4.5?
5. I can solve life problems. (**3 1 point, of which the first question is 6 points)
1, a harvester harvests 3.5 hectares of wheat in 7 hours. How many hours does it take to harvest wheat per hectare on average? How many hectares of wheat are harvested on average per hour?
2. A fuel tank can hold up to 5.7 kilograms of gasoline. How many such tanks do you need to hold 70 kilograms of gasoline?
3. Aunt Li brought 104 yuan per catty of soybean 2.8 yuan. How many kilograms of soybeans can she buy at most?
Three identical pumps can irrigate 2.4 hectares of land within 4 hours. 1 How many hectares of land can one pump irrigate per hour?
The toy factory bought a batch of cloth. It used to take 0.8 meters to make a teddy bear, but now it can make 720. Later, the technology was improved, and each piece saved 0.2 meters of cloth. How many pieces can this batch of cloth be made now?
6. The area of a classroom is 87.04 square meters, and the floor is paved with square bricks with a side length of 0.45 meters. * * * How many tiles are needed?