The second volume of mathematics in the first grade of primary school is easy to make mistakes.

First of all, judge right or wrong:

1. Two digits, one of which is one. ( )

2. The second volume of mathematics in the first grade of primary school is easy to make mistakes: two sixes in 66 have the same meaning, both of which mean six ones. ( )

3.36 Writing. ( )

8: 07 can be written as 8: 7. ( )

7. The current time is 8: 50, and it will be 9: 05 in 15 minutes. ()

Second, thinking training questions:

1. After Xiaogang gave his brother four exercise books, he also had two more exercise books than his brother. It turns out that his brother's exercise books are less than Xiaogang's.

3. Children line up, counting from the front, Xiao Fang is the eighth, followed by 20 people, one with ().

4. What should I put in brackets? ○+△=40 △+7= 15

△=( ) ○=( )

Third, solve the problem that is easy to make mistakes (total number = part number+part number = total number-part number).

1, Xiaojun made five paper boats, but four didn't. How many paper boats does Xiaojun want to make?

□□□□□□ =□ (piece)

2. Xiaoming planted three pots of flowers (picture: three pots in the first pot, five pots in the second pot and nine pots in the third pot), and he wanted to give them to Xiaohong. How many flowers can I give Xiaohong at most? At least?

□□□□□□□□ =□ (flower )□□□□□□□ =□ (flower)

3. Carrots and white radishes have 18. How many carrots and white radishes are there?

□□□□□□ =□ (piece)

4. The leader's child said: There are 8 children behind me. Q: How many children does Yi * * have?

□□□□□□ =□ (piece)

A book has 86 pages, Xiaoming has read 30 pages, and Xiaohong has read 8 pages more than Xiaoming.

(1) How many pages did Xiaohong read?

□□□□□□□ =□ (page)

(2) How many pages does Xiao Ming have left?

□□□□□□□ =□ (page)

6. A science and technology book has 78 pages. After reading part of it, Xiao Ming has 20 pages left. How many pages did he read?

? □□□□□□□ =□ (page)

7. There are 43 students playing games in extracurricular activities. Playing football is less than playing games 10. How many students play football?

□□□□□□ =□ (piece)

8. There are 45 runners on the playground, 20 more jumpers than the runners. How many jumpers are there?

□□□□□□ =□ (person)

9. Camels can live for 25 years, elephants can live for 80 years, and elephants live a few years longer than camels.

□□□□□□ =□ (year)

There are 32 cypress trees, 48 willow trees and 25 pine trees on campus.

(1) How many cypresses and willows are there?

? □□□□□□ =□ (Tree)

(2) How many pine trees are fewer than willow trees?

? □□□□□□ =□ (Tree)

(3) How many cypress trees are there than pine trees?

? □□□□□□ =□ (Tree)

(4) How many pines and cypresses are there?

? □□□□□□ =□ (Tree)

(5) How many trees are there in the three kinds of trees?

□□□□□□ =□ (Tree)

1 1. Grandpa is 58 years old and Xiaohua is 6 years old. How old is grandpa than Xiaoming?

□□□□□□ =□ (years old)

There are 38 boys and 4 girls in Grade Two of Senior High School.

(Ask and answer questions)

□□□□□□ =□ (person)

13, Xiaolan is 9 years old and her mother is 36 years old. How old is her mother and Xiaolan?

□□□□□□ =□ (years old)

14. The carpentry team has repaired a batch of tables, 38 of which have been repaired, and 17 have not been repaired. How many tables are there in this batch?

□□□□□□ =□ (Zhang)

15, Xiaoming wrote six new words in the morning and five in the afternoon. How many new words did Xiao Ming write on this day?

□□□□□□ =□ (piece)

16, Xiaohong reads a book. On the first day, she read nine pages, and there were seven pages left. How many pages are there in this book?

○□ =□ (page)

17, 48 watermelons were sold in the store, and there were 28 watermelons left. How many watermelons are there in this shop?

□□□□□□ =□ (piece)

18. There are 35 red and blue bumper cars in the children's park, including 6 blue ones. How many red cars are there?

□□□□□□ =□ (vehicle)

19, Xiao Liang reads a book. He has read 64 pages, and there are 8 pages left. How many pages are there in this book?

□□□□□□□ =□ (page)

20. Boys in Class Two a year 13 and girls 18. How many students are there in Class Two a year?

□□□□□□ =□ (piece)

2 1. There are 18 boys and 9 girls in the math group. How many more boys than girls?

□□□□□□ =□ (Name)

22. There are 48 watermelons sold in the shop, and there are 28 left. How many watermelons are there in this shop?

□□□□□□ =□ (piece)

23. I bought a schoolbag in 65 yuan and brought it back to 3 yuan. How much is a schoolbag?

□□□□□□ =□ (yuan)

24.45 flowers were given to the kindergarten, and there were 20 left. How many flowers did a * * * make?

□□□□□□ =□ (flower)

Numeric column formula

(1) How many times did they jump? (2) How many jumps does Xiaolan jump less than Xiaoming?

There are 23 in the tree, and 9 have flown away. How many are there in the tree?

□○□=□

(1) How much should I get back when I buy a schoolbag with 40 yuan money?

□○□=□

(2) How much is the oil pastel more expensive than the pencil case?

□○□=□

(3) What other questions can you ask? You can use pinyin for words you can't use. Note: Asking questions is not a formula. )

Second, filling in the blanks is easy to make mistakes.

1, with a 50 yuan, can be replaced by () a 10 yuan; Can also be replaced by () Zhang 5 yuan;

2, with a 100 yuan, can be replaced by () a 50 yuan; Can also be replaced by () Zhang 20 yuan; You can also change it to () 10 yuan.

3. Zhang Yiyuan RMB can be exchanged for () 50 yuan RMB and () 1 yuan RMB.

4. 1 Zhang Yiyuan RMB can be exchanged for () RMB with 50 cents, or for () RMB with 1 cent.

5, 5 Angle = () points; 36 points = () Angle () points; ? 8 yuan 5 Angle = () Angle?

1 yuan = () angle; 2 Angle +8 Angle = () yuan; 1 yuan -7 angle = () angle.

26 Angle = () Yuan () Angle; 100 integral = () yuan; 3 yuan 6 Angle = () Angle.

7. 10 yuan = () Yuan () Jiao; 0.50 Yuan = () Yuan () Jiao;

4 yuan +8 Angle = () Yuan () Angle; ? 5.4 points -8 points = () angle () points.

6. One 50 yuan can be exchanged for () one 20 yuan and () one 10 yuan.

7. Zhang Yiyuan RMB can be exchanged for () 50 yuan RMB and () 1 yuan RMB.

8. 1 Zhang Yiyuan RMB can be exchanged for RMB () with 50 cents or RMB () with 1 cent.

9. Multiple choice question: The price of a basketball is (). A: 68 cents, B: 68 yuan, C: 68 cents.

10, multiple-choice question: The price of a dictionary is (). A: 8 yuan. Twenty cents. B: Eight cents. Two minutes. C: 82 minutes.

1 1, multiple-choice question: 20 points can be converted into () 5 points. A: 1B: 2C: 4

12, 10 One is () ten.

13 and 20 have () ten bits and () bits. There are () ten and () one in twenty miles.

14 and 5 are larger than () 1 and smaller than () 1.

There are () 15 and 10.

Numbers 16 and 18, where 1 indicates that () is in the () position and 8 indicates that () is in the () position.

17, the unit is 5, and the decimal number is 1. This number is (), and the adjacent numbers are () and ().

The number much smaller than 9 in 18, 3, 6, 8 and 12 is ().

19, greater than 9, and the singular number less than 14 is: ()

There are () ten and () one in 20.

Numbers 2 1 and "15" are () in the tenth place, which means that the last digit is () ().

Means () ().

22、( )-5=4 ( )-4= 10 4+8=( )+7

The two digits of 23 are (), the smallest two digits are (), and the two digits greater than the smallest are ().

24 and 58 have () ten and () one. ?

7 of 25 and 74 is at () position, which means 7 (), and 4 is at () position, which means 4 ().

26. The tenth place of a number is 6, and the second place is 2. This number is (). ?

27. Write down the following figures. ?

Thirty five eight one three two seven

( )? ( ) ( ) ( ) ( )

28, 10 one is (); 10 is ().

29,6 1, 8 10 is (); 39 has () ten and () one.

30, read and write number from ().

3 1, 1 hour = () minutes.

32. Count one by one. Write down the number before 79 and the two numbers after 79.

( )、79、( )、( )

33. Number 1 10, write down the first two digits and the last two digits of 80.

( )、( )、80、( )、( )

34. Fill in the numbers in the following () to form the formula of 14.

( )+( )=( ) ( )+( )=( )

( )-( )=( ) ( )-( )=( )

35, a two-digit number, the number on the digit is 6, the number on the tenth digit is 2 more than the number on the digit, and this number is ().

36,35 is greater than 10 () and less than 63 ()?

9 is less than 57 (), and 7 is greater than 64 ()?

37. Fill in the following figures in () as required.

49 、 38 、 75 、57 、84、 63、 100、36?

()& lt()& lt()& lt()& lt()& lt()& lt()& lt( )?

38. Write three two-digit numbers () () with zero digits; Write three two-digit numbers () () () with nine digits. Write three two-digit numbers () () () with the same single digit and ten digits.

The first number of 39 and 70 is (), and the last number is ().

40, look at the clock and fill in the numbers.

It's after 2 o'clock before 10 and after 5 o'clock before 25 o'clock.

4 1, draw the hour hand and minute hand according to time (with a ruler)

6:30 1:22 1 1:55 8:07

42. On the clock face, 1 Yes 1 (), and the minute hand is 5 ().

43. What's in ()? 9+( )( )+ 10

What is the smallest number in ()? 35+3 & lt； () 17-()& lt； 10

44 plus 25 equals 30.

40. Find a pattern to fill in the blanks.

(1) Draw a picture: □△□□□□□□□□□□□□□□□□□□□□□

② Fill in: 35, 30, 25,,,.