Natural numbers + multiplication principle - examples

  1. No. of divisors
    triangle_div How many different divisors has number ??
  2. Shelf
    bookshelf.JPG How many ways are there to arrange 6 books on a shelf?
  3. Rectangles
    rectangles How many rectangles with area 3032 cm2 whose sides is natural numbers are?
  4. Candy
    bulls How many ways can divide 16 identical candies to 4 children?
  5. Stacks
    euro_stacks Annie has a total of $ 702. The money must be divided into stacks so that each buyer has the same amounth of dollars. How many options she have?
  6. Three digits number
    plot How many are three-digit integers such that in they no digit repeats?
  7. Seven-segmet
    7segment Lenka is amused that he punched a calculator (seven-segment display) numbers and used only digits 2 to 9. Some numbers have the property that their image in the axial or central symmetry was again give some number. Determine the maximum number of three-d
  8. 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?
  9. Three-digit
    numbers_5 How many three-digit natural numbers is greater than 321 if no digit in number repeated?
  10. 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?
  11. A three-digit numbers
    clocks_1 Determine the total number of positive three-digit numbers that contain a digit 6.
  12. 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.
  13. Three-digit
    seven How many three-digit natural numbers do not have the number 7?
  14. 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.
  15. Each with each
    tenis_3 Five pupils from 3A class played table tennis. How many matches did they play with each other?
  16. Lunch
    skola_15 Seven classmates go every day for lunch. If they always come to the front in a different order, will be enough school year to take of all the possibilities?
  17. How many
    numbers2_41 How many double-digit numbers greater than 30 we can create from digits 0, 1, 2, 3, 4, 5? Numbers cannot be repeated in a two-digit number.
  18. Dinning room
    cukriky_14 How many different combinations can we choose if there are 3 soups, 5 kinds of main dish and 2 desserts in the dining room?
  19. Bridge cards
    cards2 How many bridge hands are possible containing 4 spades,6 diamonds, 1 club, and 2 hearts?
  20. Inverted nine
    In the hotel,, Inverted nine" each hotel room number is divisible by 6. How many rooms we can count with three-digit number registered by digits 1,8,7,4,9?

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