Prime numbers - 7th grade (12y) - math problems
Number of problems found: 136
- Prime factors
Factor the number 6600 into the product of prime numbers.
Make decomposition using prime numbers of number 155. Result write as prime factors (all, even multiple)
- Prime factors
Write 98 as product of prime factors
- Prime divisors
Find 2/3 of the ratio of the sum and the product of all prime divisors of the number 120.
In the pool is numbers from 1 to 115. What is the probability that a randomly selected number is not a prime number?
- Common divisors
Find all common divisors of numbers 30 and 45.
- Lcm of three numbers
What is the Lcm of 120 15 and 5
How many three-digit natural numbers are divisible by 25?
- Count of roots
How many solutions has equation x. y = 7757 with two unknowns on the set of natural numbers?
- Divisible by nine
How many three-digit natural numbers in total are divisible without a remainder by the number 9?
How many rectangles with area 8713 cm2 whose sides are natural numbers are?
Find two summands of the number 42, so that its product is minimized.
- No. of divisors
How many different divisors have number ??
What is the least common multiple of 5, 50, 14?
What number should be placed instead of the asterisk in number 702*8 to get a number divisible by 6?
- Four-digit number
Find also a four-digit number, which quadrupled written backwards is the same number.
- Lcm simple
Find least common multiple of this two numbers: 140 175.
- Counting number
What is the smallest counting number divisible by 2,5,7,8 and 15?
What is the smallest length of flowerbeds we have to prepare to plant seedlings at grid 20,30,25,40 cm?
In the bowl are plums. How many would be there if we can divide it equally among 8, 10 and 11 children?
Prime numbers - math word problems. Examples for 7th grade (seventh).