Reason - 9th grade (14y) - math problems

Number of problems found: 457

  • Coins
    mince_1 On coins found was stated that from the year 87 BC. It is right?
  • One three
    dice We throw two dice. What is the probability that max one three falls?
  • Pair
    dvaja They have together 39 years - he has 2 times as she was when he was equal as she has today ....
  • Seating
    kupe_1 How many ways can 6 people sit on 6 numbered chairs (e. g. , seat reservation on the train)?
  • Two integers
    x-5-x-3-graph Two integers, a and b, have a product of 36. What is the least possible sum of a and b?
  • Six on dice
    dices2_1 What is the probability that when throwing two dice will fall at least one six?
  • Probability
    fractions_1 How probable is a randomly selected three-digit number divisible by five or seven?
  • Divisibility
    numbers_29 Write all the integers x divisible by seven and eight at the same time for which the following applies: 100
  • Chess
    chess How many different ways can initiate a game of chess (first pass)?
  • Unknown number 23
    cisla_4 Find 2/3 of unknown number, which is two thirds of the 99.
  • The dice
    hracia-kocka What is the probability of events that if we throw a dice is rolled less than 6?
  • Two-element combinations
    combinatorics Write all two-element combinations from elements a, b, c, d.
  • Tricolors
    Flag_of_the_Netherlands.svg From the colors - red, blue, green, black and white, create all possible tricolors.
  • Probably member
    math_series Look at the series 2,6,25,96,285, ? What number should come next?
  • Years
    children_12 Susan is 3 years and as she will be old as Teodor now him will be 11. How old is Teodor today?
  • Three numbers
    trojuhelnikova_cisla What is three numbers which have the property: the sum of the reciprocals of the first and second numbers is 12/7, the first and third 11/24 and the second and the third 3/8.
  • Combinations of sweaters
    sveter I have 4 sweaters two are white, 1 red and 1 green. How many ways can this done?
  • Three ints
    2016_hny The sum of three consecutive integers is 2016. What numbers are they?
  • Family
    family_14 Mom is 42 years old and her daughters 13 and 19. After how many years will mother as old as her daughter together?
  • Lines
    lines_1 In how many points will intersect 14 different lines, where no two are parallel?

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...