Natural numbers - examples

  1. Real estate
    house Residential house has three entrances numbered by odd numbers arithmetic progression. The sum of the two numbers on the corner entrances is 50. Calculate the highest of this three numbers.
  2. Divisibility
    divisibility Is the number 109433 divisible by 7?
  3. Chocolate
    cokolada Charlie bought 7 same chocolates for 14 Eur. How many euros he pay for 27 chocolates?
  4. Brick
    brick One brick is 2 kg and half a brick heavy. What is the weight of one brick?
  5. Balls
    balls I have 12 balls and my friend has 18. About how many has my friend more balls?
  6. Weeks
    calendar 55 weeks is equal to how many days?
  7. Textbooks
    textbooks After check of textbooks found that every 8-th textbook should be withdrawn. Together 74 textbooks were withdrawn. How many textbooks were in stock before withdrawn and how many after withdrawn?
  8. Cherries
    visne Cherries in the bowl can be divided equally among 11 or 16 or 4 children. How many is the minimum cherries in the bowl?
  9. School
    trieda 27 students of 6.A class is going to a trip. They pay 7 € each. The teacher got 147 €. How many children have not paid?
  10. Shelf
    bookshelf.JPG How many ways are there to arrange 9 books on a shelf?
  11. Digits
    numbers_2 Write the smallest and largest 3-digit number.
  12. Plums
    svestka In the bowl are plums. How many would be there if we can divide it equally among 10, 11 and 15 children?
  13. Summand
    plus One of the summands is 153. The second is 26 more. Determine the sum of the summands.
  14. Camp
    skauti In the camp are children. 1/4 went on a trip, 1/2 went to bathe and 99 children remained in the room. How many children are in camp?
  15. Children in the classroom
    children-school How many children are in the classroom, where Ladislav is 10. lightest and 16. heaviest in class?
  16. Diofant 2
    1diofantos Is equation ? solvable on the set of integers Z?
  17. Game room
    roulette Winner can took win in three types of jettons with value 5, 20 and 200 dollars. What is minimal value of win payable in this values of jettons?
  18. Seedcake
    pletenky Seedcake costs 50 cents. How many minimum seedcakes we must buy that we can pay in cash only whole euros?
  19. LCM
    calc_icon What is the least common multiple of 28, 42, 22?
  20. Chocolate
    cokolada_1 How many times should be broken chocolate consisting of 5 × 6 pieces to get the 30 parts?

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