# Prime numbers + multiplication - math problems

#### Number of problems found: 28

• Prime factors
Factor the number 6600 into the product of prime numbers.
• Prime divisors
Find 2/3 of the ratio of the sum and the product of all prime divisors of the number 120.
• Twenty-five
How many three-digit natural numbers are divisible by 25?
• Lcm 2
Create the smallest possible number that is divisible by numbers 5,8,9,4,3
• Count of roots
How many solutions has equation x. y = 7757 with two unknowns on the set of natural numbers?
• Rectangles
How many rectangles with area 8713 cm2 whose sides are natural numbers are?
• No. of divisors
How many different divisors have number ??
• LCM
What is the least common multiple of 5, 50, 14?
• Stacks
Annie has a total of \$ 702. The money must be divided into stacks so that each buyer has the same amounth of dollars. How many options she have?
• 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.
• Z7-I-4 stars 4949
Write instead of stars digits so the next write of product of the two numbers to be valid: ∗ ∗ ∗ · ∗ ∗ ∗ ∗ ∗ ∗ ∗ 4 9 4 9 ∗ ∗ ∗ ∗ ∗ ∗ 4 ∗ ∗
• Numbers
Determine the number of all positive integers less than 4183444 if each is divisible by 29, 7, 17. What is its sum?
• Combinations
How many different combinations of two-digit number divisible by 4 arises from the digits 3, 5 and 7?
• MO Z6-6-1
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?
• The smallest number
What is the smallest number that can be divided by both 5 and 7
• Divisibility
Determine the smallest integer which divided 11 gives remainder 4 when divided 15 gives remainder 10 and when divided by 19 gives remainder 16.
• Inverted nine
In the hotel,, Inverted nine" each hotel room number is divisible by 6. How many rooms we can count with three-digit number registered by digits 1,8,7,4,9?
• Dinosaurs
More than 30 and less than 60 dinosaurs have met at the pond. A quarter of them bathed and 1/7 saws and the rest gripped. How many were at the pond? How many were there?
• Digits of age
The product of the digits of Andrew age as 6 years ago and not equal to 0. Andrew age is also the smallest possible age with this two conditions. After how many years will be the product of the digits of Andrew age again the same as today?