Prime numbers - practice problems - page 7 of 27
Number of problems found: 540
- What is 20
What is the least number that should be added to 2497 so that the sum of the digits is divisible by 5, 6, and 10? - Peter crown ratio
Peter has only two crowns in the treasury and can divide them both in a ratio of 4:5 and in a ratio of 4:7. How many crowns does Peter have in the money box if the amount saved is less than 300 CZK? - Is prime? Which of the following numbers is prime? 21,11,18,25
- Number divisible range Find the natural number between the numbers 70 and 80 divisible without the remainder 5, 3, 15, and 25.
- Rectangle area dimensions
How many rectangles with side lengths expressed in natural numbers have an area of 96 cm²? - Divisible without remainder Determine the number by which all these numbers, 22, 18, 25, 15, 35, and 10, are divisible without remainder. The number is greater than 1.
- Steel bar cutting
We must cut three steel bars with 24 dm, 3 m, and 160 cm lengths into equal lengths. Find their maximum length and number. - Prime number sum
What number do you get when you add the number 1 to the sum of all prime numbers less than 30 and then divide by the smallest odd prime numbers? - Number divisor list List all composite positive two-digit numbers whose greatest common divisor with 51 is 17.
- Steamer port return
Two steamers set out on a voyage from the same port. The first steamer returns to port every fourth day, and the second steamer returns every fifth. How many days do they meet again? - Number divisor sum Calculate the sum of all divisors of the number 70.
- Prime number probability We randomly draw one out of 18 cards with numbers from 1 to 18. What is the probability that the ticket drawn is a prime number? Write the result as a decimal number rounded to two decimal places.
- Plate grid box
We must draw a square grid on a rectangular plate measuring 154 cm and 210 cm. What should be the side length of the largest possible box? How many fields will be on the board? - Delivery scrap percentage
In the first delivery of 120 parts, there was 5% waste. In the second delivery in which, 10% of the 80 were scrapped. How much scrap was brought in with the first and second deliveries combined? What % of scrap was there in both deliveries of parts, out o - Library book increase
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? - Determine 6 Determine the least common denominator 3/4 and -5/6
- Mr. Product
The product of the ages of all of Mr. Product's children is 1,408. The youngest child's age is half the oldest child's age. How many children does Mr. Product have, and how old are they? - Line - normal form
What is the equation of the line whose x-intercept is - 3 and y-intercept is -4? Find coefficients A, B, C in normal equation of line: Ax + By = C - The GCF If the GCF is 40 and the number is 8, what is the number if it lies between 70 and 80?
- Lcm and hcf
If the LCM of a and 18 is 36 and the HCF of a and 18 is 2, then a = …
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