Prime numbers - 6th grade (11y) - math problems

Number of problems found: 121

  • Prime factors
    prime Factor the number 6600 into the product of prime numbers.
  • Prime factors
    prime Write 98 as a product of prime factors
  • Decomposition
    prime_factorization Make decomposition using prime numbers of number 155. Result write as prime factors (all, even multiple)
  • John Smith
    books_1 John Smith is reading a 435-page novel. If he reads the same number of pages per day and the number is a prime number greater than 10, how many pages per day will he read?
  • Lcm of three numbers
    prime What is the Lcm of 120 15 and 5
  • Count of roots
    eggs How many solutions has equation x. y = 7757 with two unknowns on the set of natural numbers?
  • Fractions
    cmp_fractions Sort fractions ? by its size. Result write as three serial numbers 1,2,3.
  • Lcm 2
    lcm Create the smallest possible number that is divisible by numbers 5,8,9,4,3
  • Divisible by nine
    numbers_2 How many three-digit natural numbers in total are divisible without a remainder by the number 9?
  • Common divisors
    prime Find all common divisors of numbers 30 and 45.
  • LCD 2
    zlomky_6 The least common denominator of 2/5, 1/2, and 3/4
  • Number
    prime What number should be placed instead of the asterisk in number 702*8 to get a number divisible by 6?
  • LCM of two number
    numbers2_19 Find the smallest multiple of 63 and 147
  • Numbers
    ten Determine the number of all positive integers less than 4183444 if each is divisible by 29, 7, 17. What is its sum?
  • What is 13
    numbers_5 What is the number between 50 and 55 that is divisible by 2,3,6,9?
  • Plums
    svestka In the bowl are plums. How many would be there if we can divide it equally among 8, 10 and 11 children?
  • Decompose
    cinema_5 Decompose into primes and find the smallest common multiple n of (16,20) and the largest common divisor D of the pair of numbers (140,100)
  • LCM
    calc_icon What is the least common multiple of 5, 50, 14?
  • Counting number
    numbers2_49 What is the smallest counting number divisible by 2,5,7,8 and 15?
  • MO Z6-6-1
    kruhy_1 Write integers greater than 1 to the blanks in the following figure, so that each darker box was product of the numbers in the neighboring lighter boxes. What number is in the middle box?

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...
Prime numbers - math problems. Examples for 6th grade (the sixth graders).