68×99= 47 1× 10 1= 24× 10 1= 456×99=

24×999= 38×999= 478×99= 654×99=

56×54= 45×65= 69×49= 94×9 1=

23×83= 14×94= 19× 1 1= 32×38= 182×324= 403×457= 158×702= 306× 178=

1. Xiaoming has 10 yuan, which is more than the others. 2 yuan, how much did Xiao Ming spend?

2. There was 2 16 kg of rice. On the first day, 34 kg was used, on the second day, 27 kg was used. How many kg of rice was used on the second day? How many kilograms of rice are left?

There are 237 yellow flowers, 45 more red flowers than yellow flowers. How many yellow flowers and red flowers are there?

Xiaoming has 20 pens. After giving Xiao Li three pens, he still has two more pens than Xiao Li. How many pens does Xiao Li have?

1.2,3,5,8, 12,( ),( ) 2. 1,3,7, 15,( ),63,( )

3. 1,5,2, 10,3, 15,4,( ),( )

4. What numbers do ○, △ and respectively stand for?

( 1)、○+○+○= 18 ? (2)、△+○= 14 (3)、+++=20

○=( ) △=( ) =( )

5.△+○=9 △+△+○+○+○=25 △=( ) ○=( )

Second, the application problem:

1. There are 35 sugars. According to the order of naughty-laughing-Tintin-Dong Dong, everyone sends one at a time. Think about it. Who will get the last one?

2. Naughty began to have money in 300 yuan, so he went to 56 yuan to buy books and 128 yuan to buy stationery. How much money did naughty leave behind?

International Mathematical Olympiad

I. Calculation

43+26+7+4 54+38 -54 19+ 19+ 19+ 19

22+23+24+25+5+6+7+8

Second, from 1 to 130, how many "2" did a * * * count?

Students in Class 3 and Class 2 (1) are arranged to do exercises in two rows with equal numbers of adults. Xiaohua stands in a row. He is 12 in the front and 9 in the back. How many students are there in Class One (1)?

13 The children have caught five "chickens" by playing the game of "the eagle catches the chicken". How many didn't get caught?

It's getting late. Mom asked Xiao Ming to turn on the light in the room, but the naughty Xiao Ming pulled the switch nine times in a row. Can you tell me if the light is on? What about 20? 100?

Exercise 3 of Olympiad Mathematics in Grade Two

1. Fill in □ at the right end of the following operation symbols completely different from the right end to make all formulas valid.

( 1) 1× 1× 1= 1□ 1□ 1

(2) 12÷4-3= 12□4□3

(3)20÷ 10+4=20□ 10□4

(4)6 +6-6-6 = 6□6□6□6

2.5 cats eat 5 mice and 20 cats eat 20 mice. How long does it take for 5 minutes?

3. 1 goose weight +3 chicken weight = 65438 weight +00 duck weight = 8 chicken weight = 65438 weight +06 duck weight.

1 goose weight = () duck weight 1 goose weight = () chicken.

4. Add 5, subtract 7, multiply 4 and divide 6 to get 18. What's this number?

Six red socks and six white socks are cluttered in a drawer. These 12 socks are all the same except the color. If you take out two socks of the same color from the drawer with your eyes closed, at least take out a few socks, so as to ensure that two of them will match into a pair of socks of the same color? What if it is red?

6. The sum of two numbers is 174, and one of these two numbers is 4 larger than the other. What are these two numbers?

It is known that the grain in big warehouse is 496 tons more than that in small warehouses, and that in big warehouse is three times as much. How many tons are there in large and small warehouses?

8. The school library bought 448 literature books and science books, among which science books are three times as many as literature books. How many literature books and science books are there?

9. The sum of the numbers A, B and C is 108. The number A is three times that of B, and the number B is twice that of C. What are the numbers A, B and C respectively?

10. For three digits, the sum of the numbers on each digit is 15, and the number on the hundredth digit is 5 less than the number on the single digit; If the unit and the hundred digits are reversed, the new number is three times less than the original number. 39. So the original three digits are ().

Sophomore olympiad 4

First, fast calculation.

1.9+99+999 2. 18+ 19+20+2 1+22

Second, find a rule to fill in numbers:

( 1) 100,95,90,85,80,( ),70

(2)2,4,6,( )

Third, Xiaohong has a bundle of pencils. She gave her brother half one first, and then gave the remaining half one to her sister. Finally, she had only one pencil left. Xiaohong has _ _ _ _.

4. Xiao Liang is 10 years old and his mother is 36 years old. When Xiao Liang was 25, his mother was older than Xiao Liang.

5. It is known that δ+χ= 30 and χ = δ+δ.

△= ○=

Six, the weight of five strawberries is equivalent to the weight of an apricot, and the weight of three apricots is equivalent to the weight of a peach.

There are 100 books in Class One and Class Two. If Class One gives Class Two 15 books, then Class One has as many books as Class Two.

Eight. On the podium of a primary school mathematics competition, five students took the stage to receive the prize. Every two of them shook hands with each other. Q: Did they shake hands?

Nine, the bell of the Bell and Drum Tower strikes the time. It takes 4 seconds to strike five times at 5 o'clock. Does it take 2 seconds to type 12 at noon?

10. There are 360 oranges and apples, of which the number of oranges is twice that of apples. How many oranges and apples are there?

Eleven, with the number 0, 1, 2, 3, 4, you can get _ _ _ _ different sums.

Sophomore olympiad 5

Fill in the blanks according to the rules.

1.23456, 34562,45623,( )( )( ).2. 1,2,4,7, 1 1,( )( )( )

3. 1,0, 1,2,3,5, ( )( )( ) .4.90 1,802,703, ( )( )( ) .

5. 1,2,4,8, ( )( )( ) .6.0, 1,4,9, 16,( )( )( )

7.0,2,6, 12,20 ( )( )( ) 8.90,89,87,84,80,( )( )( ),

9. 1, 1, 2, 3, 4, 5, 8, 7, 16, 9, () () There are others, wait a minute.