Prime numbers - practice for 12 year olds - page 4 of 14
Number of problems found: 270
- Multiple 16733
What result do we get when dividing the least common multiple of the numbers 12 and 8 by their greatest common divisors? - Sunbathed 2861
There were more than 40 and less than 80 children by the pond. A fifth of the children took a bath, and a seventh sunbathed. How many children were at the pond? - Check divisibility
Put a check under each column to identify whether each number is divisible by 2, 5, 10, 3, 6, or 9. 54180; 1 624 2700 5605 568 - Probability 65464
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. - Difference 5847
I reduced the unknown number by five and multiplied the result difference by three. Finally, I increase the resulting product by six and get the least common multiple of the numbers 3 and 8. Calculate the unknown number. - Lcm = 22 + gcd
The least common multiple of two numbers is 22 more than their greatest common divisor. Find these numbers. - Steps
Peter makes steps long 70 cm, John 45 cm long. After how many meters do their footsteps meet? - Plums
In the bowl are plums. How many would be there if we could divide it equally among 8, 10, and 11 children? - Rectangles 70304
How many rectangles with side lengths expressed in natural numbers have an area of 96 cm²? - Electric 36771
There was a gear in the electric mixer. The drive wheel had 24 teeth. The driven wheel had 36 teeth. When did the same teeth of both wheels meet again? - Three-digit 4791
How many three-digit numbers divisible by four can we create from the numbers 1, 2; 3; and five if we cannot repeat the digits in the number? - GCD&LCM of three
GCD of three numbers is 30 and LCM is 900. As two the are 60 and 150, find the number. - Mangoes
Chris has 12 mangoes, and Jay has 18 mangoes. Each of them will share the mangoes with their friends. What's the greatest number of mangoes each of their friends gets if Chris and Jay will give the same number of mangoes? - The missing digit
Complete the missing digit in the number 3 ∗ 43 to form a number divisible by three. If there are multiple options, list them all. (The omitted digit is marked with the symbol ∗. ) Answers must be justified! - School
Headteacher thinks about whether the distribution of pupils in a race in groups of 4,5,6,9 or 10. How many pupils must have at least school possible options? - Plum
On the platter are plums. How many were there if its have to be able to share equally among 8,10, and 12 children? - Rectangles
How many rectangles with area 3152 cm² whose sides are natural numbers? - Cherries 55831
There are cherries in the basket. How many of them are if we can divide them equally between 3, 4, or 5 children? - Quotient
Find the quotient before the bracket - the largest divisor 51 a + 34 b + 68 121y-99z-33 - Flowerbeds
What is the smallest length of flowerbeds we must prepare to plant seedlings at grids of 20,30,25,40 cm?
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