Natural numbers + reason - practice problems - page 2 of 28
Number of problems found: 543
- Big number
How many ones (digits) does the number 12345678910111213141516 ... 4647484950 contain? Did we write all natural numbers from 1 to 50 in a row? - Expressions 62284
Express the numbers 18, 28, 32, 40, 48, and 200 as numeric expressions composed of the digits 5. - Six-eights
Six-eights of the one hundred pupils joined the Math Glee club. If the Math Glee club members were grouped into three, how many members were in each group? - 214568793 62744
Find the three digits that need to be deleted from 214568793 to make the number as small as possible. What is the sum of these deleted digits?
- Substituted 4151
Find out what numbers need to be substituted for the letters X, Y, and Z to have the following relation: XZY + XYZ --------- YZX - Hundred 7239
Each of the six horses ate just 75 days in a hundred days. How many and at least days could be during which at least five horses ate? - Missing numerals
John described the example but forgot the numerals. Fill them in so that the result is correct. (2 solutions): 3 3 3 3 = 8 - Passengers 45501
During the rescue of the sinking ship, the passengers were divided into three boats in a ratio of 3:4:5. There were 15 passengers in the first boat. How many passengers were rescued together? - On the floor
You enter the room, and there are two dogs, four horses, one giraffe, and one duck on the bed. Three chickens are flying over the chair. How many feet are on the floor?
- According 7038
When students are ranked according to height, Katka is 12th Front and 17th Back. How many children are in the class? - Row for lunch
There are less than 66 people in a row for lunch. In front of Eva, there are 28 students. Behind Martin, there are 30 people. Between Eva and Martin, there are 17 people. How many students stand behind Eva if Martin stands in front of Eva? - Following 31401
The two natural numbers are in the ratio of 3:13, and we will denote their sum. Which of the following values cannot its sum be? a) 64 b) 96 c) 112 d) 39 - Statements 17733
There are 24 students in the class, and 5/8 of them are girls. Which of the following statements is true: And there are 15 boys in the class, B there are more boys than girls in the class, There are 9 boys and 15 girls in C's class - Games
Jack and Paul decided to play chess against each other. They bet ten pesos on each game they played. Jack won three bets, and Paul won fifty pesos. How many games did they play?
- No. 215
From the number 215, we can create a four-digit number that, among its numbers, manually type any other digit. Thus, we created two four-digit numbers whose difference is 120. What two four-digit numbers might that be? - Tablets 80294
Pepík is sick and has to take 1 tablet three times a day. How many days will a pack of 30 tablets last him if he only takes 1 tablet in the morning and evening every third day? - Decorative 5887
Lenka tried to write the word Easter in decorative letters. To train the font, she wanted to write it on paper several times in a row. Which letter did she write as the 273rd in a row? - Ichthyosaurs 5577
There are five huge aquariums on an island in Jurassic World. At least two and at most six ichthyosaurs swim in each of them, with a different number in each aquarium. How many ichthyosaurs are there in total in all the aquariums? - Apples
Three types of apples are mixed in a box. What is the smallest number of apples we have to take from the box so that there are certainly at least three apples of the same kind among them? (Explain your solution!)
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