Natural numbers + reason - practice problems
Number of problems found: 431
- Solution!) 73094
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!)
- Contains 66184
Which natural number contains 12 thousand, 15 hundred, 21 tens, and 11 units?
- 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?
- Expressions 62294
Express the numbers 18, 28, 32, 40, 48, 200 as numerical expressions composed of exactly five pairs.
- Expressions 62284
Express the numbers 18, 28, 32, 40, 48, 200 as numeric expressions composed of the digits 5.
- White balls
I have 3 white balls and 5 red balls in my pocket. How many least balls do I have to remove from the bag to make sure that the pulled out ball is definitely red?
- Four-digit number
For a four-digit number abcd, ab: bc = 1: 3 and bc: cd = 2: 1 (ab, bc and cd are two-digit numbers from digits a, b, c, d). Find this number(s).
- 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?
- 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?
- 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?
- Signs 40171
Fill in the signs to apply 5 5 5 5 5 = 14
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?
In 2014, the sum of the ages of Meghan's aunt, her daughter and her granddaughter was equal to 100 years. In what year was the granddaughter born, if we know that the age of each can be expressed as the power of two?
- Eight chairs
There are eight chairs by the table and one more child sitting on each one. There are two times more girls than boys. How many girls and how many boys can there be?
- 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
- On the floor
You enter the room and there are 2 dogs, 4 horses, 1 giraffe and one duck on the bed, 3 chickens are flying over the chair. How many feet are on the floor?
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?
- Numbers 22811
How many digits are in the numbers 1 to 100?
- 12345678910111213141516 7989
How many ones (digits) does the number 12345678910111213141516 ... 4647484950 contain? We wrote all natural numbers from 1 to 50 in a row?
ABC + DEF = GHIJ replace letters with numbers so that the sum is correct (different letters = different numbers)
Natural numbers - practice problems. Reason - practice problems.