Variations + natural numbers - math problems

Number of problems found: 33

  • Big numbers
    numbers_1 How many natural numbers less than 10 to the sixth can be written in numbers: a) 9.8.7 b) 9.8.0
  • Three-digit
    numbers_5 How many three-digit natural numbers are greater than 321 if no digit in number repeated?
  • Digits
    numbers2_18 How many natural numbers greater than 4000 which are formed from the numbers 0,1,3,7,9 with the figures not repeated, B) How many will the number of natural numbers less than 4000 and the numbers can be repeated?
  • Number 4
    numbers_3 Kamila wrote all natural numbers from 1 to 400 inclusive. How many times did she write the number 4?
  • Dd 2-digit numbers
    numbers_49 Find all odd 2-digit natural numbers compiled from digits 1; 3; 4; 6; 8 if the digits are not repeated.
  • A three-digit numbers
    clocks_1 Determine the total number of positive three-digit numbers that contain a digit 6.
  • Bookshelf and books
    bookshelf How many ways can we place 7 books on a bookshelf?
  • Three digits number
    3digit From the numbers 1, 2, 3, 4, 5 create three-digit numbers that digits not repeat and number is divisible by 2. How many numbers are there?
  • Digits
    numbers_48 How many five-digit numbers can be written from numbers 0.3,4, 5, 7 that is divided by 10 and if digits can be repeated.
  • No. of divisors
    triangle_div How many different divisors have number ??
  • Three digits number
    plot How many are three-digit integers such that they no digit repeats?
  • To improve
    one_2 To improve her handwriting Paula practices writing the numbers 1 to 200 in words. How many times will she have written the word "one" in all?
  • Numbers
    numbers_3 How many different 3 digit natural numbers in which no digit is repeated, can be composed from digits 0,1,2?
  • Graduation party
    dancers There are 15 boys and 12 girls at the graduation party. Determine how many four couples can be selected.
  • Boys and girls
    dancers There are 20 boys and 10 girls in the class. How many different dance pairs can we make of them?
  • Coffe cups
    hrnceky We have 4 cups with 4 different patterns. How many possible combinations can we create from 4 cups?
  • Year 2020
    eq222 The four-digit number divided by 2020 gives a result of 1, **. (Can not be in form 1,*0. ) Write all the options.
  • How many 4
    numbers2_1 How many 4 digit numbers that are divisible by 10 can be formed from the numbers 3, 5, 7, 8, 9, 0 such that no number repeats?
  • Pages counting
    books_39 There are pages numbered from 2 to 104 in the book. How many digits have to be printed to number the pages?
  • Seedbeds
    mrkva2 The father wants to plant 2 seedbeds of carrot and 2 seedbeds of onion. Use a tree chart to find how many different options for placing the seedbeds he has.

Do you have an interesting mathematical word problem that you can't solve it? Submit a math problem, and we can try to solve it.



We will send a solution to your e-mail address. Solved examples are also published here. Please enter the e-mail correctly and check whether you don't have a full mailbox.

Please do not submit problems from current active competitions such as Mathematical Olympiad, correspondence seminars etc...
See also our variations calculator. Variations - math problems. Natural numbers - math problems.