1, pen multiply, multiply to which number is more than several tens, and () to what number.

2. When calculating 50×70, first calculate ()× (), and then add () zeros at the end of the product.

30 times of 3 and 27 is (), 12 30 is ().

4,0 and any number get (), 1 and any number get ().

5. Two digits are multiplied by two digits, and the product may be () digits or () digits.

6. The product of19×19 is about ().

The product of three digits of 7 and the smallest two digits is ().

There are () zeros at the end of the product of 8.26×50.

Second, the judgment question.

1, 0 is multiplied by any number to get 0. ()

The product of 2.3 1×69 is about 2 100. ()

There are only two zeros at the end of the product of 3.50×60. ()

There are several zeros in the middle of the factor, and there must be several zeros at the end of the product. ( )

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

6. The tenth digit is multiplied by 2 by 13, and the product is 26. ( )

Third, I'm a little psychic.

1, a number written directly.

50×50= 80×30 = 52020=

60×30 = 2 1×40= 60×200=

10×500= 600× 13= 25×200=

83×40 = 70×50= 45×20=

2. Use vertical calculation.

32× 13 27×56 43×58

25× 17 63×72 45×25

3. Off-mold calculation.

68+24×40 125÷5×39

78÷3÷5 125×8+23 1

4. Is the following calculation correct? Correcting mistakes.

2 8 4 8

× 2 4 × 6 5

1 2 2 2 4 0

6 1 6 2 8 8

6 2 8 2 ( ) 5 2 8 ( )

Solving math problems in grades five and three.

1. The school group organized a visit to the Terracotta Warriors, with 46 visitors, including students 18. Fares are as follows:

Student ticket 28/ yuan

Adult ticket 60/ yuan

Group ticket 40/ yuan

(1) How much is it to buy a student ticket? How much does it cost to buy an adult ticket?

(2) How much is a * *?

(3) How much does a group ticket cost?

(4) Which way would you choose and why?

It takes Zhang Lan 25 minutes from home to school. She walks 74 meters per minute. How far is her home from school?

3. There are 32 male employees in a factory, and the number of female employees is 18 times that of male employees. How many employees are there in this factory?

4. Three cars 163 student trip. There are 54 people in the first two carriages, and how many people in the third carriage?

The last seat in the school auditorium is1row 25. There are 436 people in our school. Are these seats enough?