After 20 10, the first volume of mathematics in the second grade of primary school is all comprehensive exercises.

1. Party A, Party B and Party C stand in a row and take photos. How many arrangements are there?

2.()+()& gt； () × () [The same integer must be added in brackets]

3.()+( )= ()×( )[ The same integer must be added in brackets]

4.( )×( )×( )=( )+( )+( )

5. There are 10 candles in a house. A gust of wind blew out six candles. Mother closed the doors and windows. There are () candles in the room in the morning.

6. Mom gave Xiaoming a big box with six paper boxes, and each paper box has four small boxes. Xiaoming has () boxes.

7. There is a long-distance race on the sports field. There are seven people running in front of each runner and seven people running behind each runner. There are () athletes on the playground now.

8. A snail wants to climb out of the dry well to see how big the sky is. It climbs 3 meters every day and goes down 2 meters at night. I didn't climb to the wellhead until the eighth day. This dry well is 10 meter deep.

9. Digital riddles. (1) The head and tail are integrated, and the waist is also integrated. It looks like one, but it's not one. What is () 2 times 8?

What is five times eight?

What is 7 times 8?

What is 9 times 8? A barrel of oil weighs 40 kilograms, and it weighs 22 kilograms after pouring out half of the oil. How much does this bucket weigh? How much does this barrel of oil weigh? Xiaoming bought clothes, shoes and hats with 270 yuan. Clothes are more expensive than shoes 140 yuan, and clothes and shoes are more expensive than hats10 yuan. How much did you spend on shoes?

First, complete the formula.

47 () 46 () () 42 59 ()

68 () 8 () 64 99 () 7 () 56

57 () () 742 38 () 79 ()

Fill in the blanks.

1. Teacher Chen took 15 children, both male and female, to the People's Theatre, and one * * * wanted to buy () tickets.

Formula:

Children line up to do morning exercises. Xiaoming has five people in front and 10 in the back. Xiao Ming ranks ().

A * * * has () children. Formula:

Children line up to jump rope. From left to right, Jia Jia ranked eighth, and from right to left, he ranked ninth. This row is * * *

There are () children. Formula:

4. Every two people shake hands, three people shake hands ().

5, every two people play a game, four students a * * * than ().

6. How many two-digit numbers can you write with four numbers: 6, 5, 7 and 9?

7. Lingling read a book with a page of 100. On the first day, she read 12 from the first page, and the next day, she read 10.

Three days from page (). Formula:

8. Kobayashi and Xiaojun played table tennis for two hours, and each played () hours.

9. Next year 10 years old, my father is 32 years old. Xiao Ming is () years younger than his father. Three years later, Xiao Ming was () years younger than his father, and 10 years later, Xiao Ming was () years younger than his father.

10, the number on the tenth bit is multiplied by the number on the second bit to get 24, and the number on the tenth bit is subtracted from the number on the second bit to get 2, such a two-digit number.

There are:

1 1, Kobayashi's height 1( )40 () The door is about 2 () The classroom is 8( 0) long and 6 (0) wide12, and the actual time is written on the clock face. Rewrite the following addition formula into multiplication formula, or rewrite the multiplication formula into addition formula.

( 1)5+5+5+5 + 5 + 5 =( )×( )

(2)3×8=( )+( )+( )

(3)9+9+9+9+9+9+9 =( )×( )

2. Complete the formula:

26 () 57 () 49 () 25 () 36 () 28 () 44 () 39 () 27 ( ) 48 () 19 () 45 ()

3. Calculate by multiplication formula:

5×9= 9×4= 2×8= 7×3=

5×7= 6×6= 2×9= 4×6=

5×8= 2×5= 6×8= 7×2=

3×6= 7×4= 1×5= 5×4=

9×6= 3×8= 3×6= 5×6=

7×7= 9×4= 3×5= 9×9=