Prime numbers + multiplication - practice problems
Number of problems found: 47
- GCD&LCM of three
GCD of three numbers is 30 and LCM is 900. As two the are 60 and 150, find the number. - Children 81752
How many nuts would we need at least to divide the nuts equally among 10 or 18 children? - Positive integer integral
How many different sets of a positive integer in the form (x, y, z) satisfy the equation xyz=1400? - Increased 64324
The number of books in the city library increased by 0.2% in 2008 and 0.6% in 2009. At the same time, the total number of books remained less than 300,000. How many books were added to the city library in 2009? - Mr. Product
The product of ages of all of Mr. Product's children is 1408. The age of the youngest child is equal to half the age of the oldest child. How many children does Mr. Product have, and how old are they? - A number 5
A number is divisible by 24, 25, and 120 if it is increased by 20. Find the number. - Two-digit number
In a two-digit number, the number of tens is three greater than the number of units. If we multiply the original number by a number written in the same digits, but in reverse order, we get product 3 478. Find the original number. - Find unknown number
What is the number between 50 and 55 that is divisible by 2,3,6,9? - Three-fifths 34771
Calculate three-fifths of the ratio of the product and the sum of all prime divisors of 240. - Prime divisors
Find 2/3 of the sum's ratio and the product of all prime divisors of the number 120. - Wedding guests
Fifteen wedding guests could not agree on who would stand in the wedding photo. The groom suggested that all possible sets of wedding guests be made in the photographs. - Non-repeating 30101
1. How many different options are there for exchanging a ten-euro bill with one-euro, two-euro, and five-euro bills? a) 5 b) 8 c) 14 d) 10 2. How many non-repeating three-digit numbers can be written using odd digits? a) 999 b) 225 c) 60 d) 25 - Divisors of 560
Which of the numbers 5, 6, 7, 14, and 15 are divisors of 560? Please justify the answer. - Prime factors
Factor the number 6600 into the product of prime numbers. - Consecutive 23251
Find the LCM of four consecutive natural numbers. Its sum is 42. - Twenty-five
How many are three-digit natural numbers divisible by 25? - The smallest number
What is the smallest number that can be divided by both 5 and 7 - Inverted nine
In the hotel Inverted Nine, each hotel room number is divisible by 6. How many rooms can we count with the three-digit number registered by digits 1,8,7,4,9? - Different 6709
Milan found out that he could wear pants and a T-shirt in a total of 28 different ways. How many T-shirts and pants can he have? List all options. - Divisors 6619
Which natural number less than 100 has the largest number of divisors?
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