Test questions and answers of unit 3 in the first volume of fourth grade mathematics

First, fill in the blanks.

1. Calculate 16? At 300, you can calculate () first, and then add () at the end of the product.

2. 103 times 12 is (), and 3 1 200 is ().

3. The product of the smallest three digits and the largest two digits is ().

4. Method of multiplying three digits by two digits: multiply the digits of the second multiplier with those of the first multiplier, and the end of the product is aligned with the () of the second multiplier; Multiply each bit of the first multiplier by. The number on the tenth bit of the second multiplier, and the end of the product is aligned with the tenth bit of the second multiplier; Finally, multiply the twice product ().

5. A bag of flour weighs 50 kilograms, a truck can hold 142 bags, and a truck can hold () kilograms of flour.

6. Xiao Ming is finishing calculating 237? 62, if you want to verify whether the calculation result is correct, you can use (). You should press () first, then (), then () and finally ().

7. fill in ○? & gt& lt？ Or? =? .

30? 18 1○332? 18 1

27? 200○22? 270

604? 15○ 15? 606

123? 40○ 132? 30

234? 30○245? 29

808? 39○798? 29

According to statistics, every mid-range hotel in China uses 258 pairs of disposable chopsticks every day and () pairs of disposable chopsticks every month (30 days).

Second, the judgment question. (to the painting? , wrong painting? )

1. The product of three digits multiplied by two digits must be greater than the product of two digits multiplied by two digits. ( )

2. A three-digit multiplied by 0 equals a two-digit multiplied by 0. ( )

3. There are two zeros at the end of two multipliers, and there must be two zeros at the end of the product. ( )

4. The key is the key of calculator. ( )

The product of three digits multiplied by two digits must be four digits. ( )

Third, multiple choice questions. (Put the serial number of the correct answer in brackets)

1.280? There are () zeros at the end of the product of 50.

A. 1 B. 2 C. 3

2. The product of the following formula and 180? The product of 60 is different from ().

A.360? 30 B. 90？ 120 C. 720？ 20

3. The product of three digits multiplied by two digits is () digits.

A. three b's, four c's, four or five.

4.605? The median value of the product of 13 () 0.

A. there is a B. There are two C. No.

5. 245 vertically? At 36: 00, 2 times 3 is actually ().

A.2? 3 B. 20？ 30 degrees Celsius, 200 degrees Celsius? 30

Fourth, the calculation problem.

1. Write the number directly. (12)

3 10? 3= 280? 2= 140? 7=

350? 2= 89? 100= 32? 20=

230? 4= 140? 20= 730? 0=

230? 30= 140? 5= 300? 30=

2. Use vertical calculation. (12)

162? 2 1= 64? 32 1= 7 13? 15=

308? 2 1= 130? 24= 135? 12=

5. Find out the rules and fill in the blanks.

Observe the relationship between the factors and products of the first three formulas in each group and complete the fourth formula.

1.9? 5=45

99? 95=9405

999? 995=994005

9999? 9995=( )

2.2345? 1000 1=23452345

7629? 1000 1=76297629

5438? 1000 1=54385438

2764? 1000 1=( )

Sixth, solve the problem.

1. The average lucky money in Class One, Grade Four is 185 yuan. How much is the lucky money for 53 students?

2. If each case contains 24 bags of milk, and a milk station has 1500 bags of milk, will 120 boxes be enough?

3. It takes 1 14 minutes for the first artificial earth satellite launched by China to orbit the earth once. 1550 minutes can you circle the earth 15 times?

Unit 3 Test Paper Answers

1. 1. 16? 3=48 two zeros

2. 1236 6200 3.9900 4. Add the fifth place. 7 100

6. calculator 237? 62 =

7.& lt& lt& lt& gt& lt& gt8.7740

Second, 1. 2.？ 3.？ 4.？ 5.？

Three. 1.C2.C3.C4.C5.C。

Four. 1.930 560 980 700 8900 640 920 2800 6900 700 9000

2.3402 20544 10695 6468 3 120 1620

Five, 1. 56536.68668686667

6. 1. 185? 53=9805 (yuan)

2. 120? 24=2880 (package) 2880 >: 1500 is enough