Reason - 8th grade (13y) - math problems

Number of problems found: 473

  • Seven
    post_1 Seven friends agree to send everyone a holiday card. How many postcards were sent?
  • 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 ....
  • 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?
  • 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
  • Brackets
    brackets Place one pair of brackets in expression 20-16 + 10 - 4 - 2 so that the result will be 0.
  • Chess
    chess How many different ways can initiate a game of chess (first pass)?
  • 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?
  • Marriage sttus
    family_26 In our city, there are 3/5 of the women married to 2/3 of the men. Find what part of the population is free.
  • 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?
  • Two ages
    twodigits_1 Gabrielle is 9 years younger than Mikhail. The sum of their ages is 87. What is Mikhail's age?
  • 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?
  • Series
    posloupnost_an Andrew wrote this series of numbers: 1,3,7,15, .... n. Which number in the series does not belong? ?

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