Reason - practice for 9 year olds
Number of problems found: 67
- Arithmetic progressions.
Find the sum of all the numbers between 9 and 204, which is exactly divisible by 3. - 52 cards
A hand of five cards is dealt from a pack of 52 playing cards. How many different hands can be dealt that contain three aces? - Different 82982
How many different ways can Milka, Peter, Joseph, and Renata sit next to each other in the cinema if Milka always sits in seat number 1 and Peter always sits in seat number 4? List all options. - Lilies 81910
There are twice as many pink water lilies in the pond as yellow water lilies, but twice as few as white water lilies. Which water lilies are the most and which are the fewest? How many times more white water lilies are there than yellow water lilies? How - Positive integer integral
How many different sets of a positive integer in the form (x, y, z) satisfy the equation xyz=1400? - Seven-liter 80518
Happy Mom needs to measure exactly 6 liters of water. It only has a five-liter and a seven-liter container. How can a mother measure exactly 6 liters of water by gradually pouring? He doesn't care about other containers. - Simultaneously 80392
Dulikovci, Elikovci, Filikovci, and Galikovci visited each other often last month. Each family visited each family exactly once. How many visits did all four families make together? If two families came to visit one family simultaneously, count it twice. - Triangle from sticks
Bob the boulder has many sticks of lengths 3.5 and 7. He wants to form triangles, each of whose edges consists of exactly one stick. How many non-congruent triangles can be formed with the sticks? - 4 digit number
I am a four-digit number. My thousand period has a first digit which is thrice the second digit, and the second digit is two more than the third digit. All the rest of the digits are zeros. What number am I? - Exchanged 59993
Lukáš and Laco exchanged stamps. Before the exchange, Lukáš had 25 more marks than Laco. After the exchange, he had more Laco marks. At least how many stamps does Laco receive from Lukáš? - White balls
I have three white balls and five red balls in my pocket. How many balls do I have to remove from the bag to ensure the pulled-out ball is red? - Organizers 45351
The ski organizers have to print the start numbers from 1 to 45. How many times do they use the number 3 when printing? - Benches 18013
There are 12 benches in the park. Four people can sit on the bench. At least two people sit on each of them. How many and most people sit on benches? - Pupils
There are 27 pupils in the classroom. They can swim 21 and ski nine pupils. Neither swim nor ski three pupils. How many pupils can swim and ski? - Combined 6724
Cows and sheep are kept on the farm. There are 37 cows, which is 25 more than the sheep. There are seven times fewer horses than cows and sheep combined. How many animals do they keep on the farm together? - Beginning 6710
Artisans build a fence 24M long. The posts are placed 3 m apart. We will also set the posts at the beginning and end of the fence. How many posts will be needed? - 3 cats
Three cats eat three mice in 3 days. How many mice will be eaten by ten cats in 10 days? - Branches 5825
Parrots, a few of them flew around and sat down anyway. 3 on the dog's back. There are 29 parrots. There were 9 more sitting than flying. 6 more sat on the branches than on the grass. How many parrots were still flying? How many were sitting on the branch - Expensive 5658
An unnamed brand TV is the store's fifth most expensive and tenth cheapest TV. How many different TVs are there in the store? - Shipments 5620
If you know that a quarter of a mail order and 300 grams weigh the same as the whole shipment, then two such shipments weigh how many grams?
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