Prime numbers - practice for 12 year olds - page 2 of 14
Number of problems found: 270
- Determine 6
Determine the least common denominator 3/4 and -5/6 - Summands
Find two summands of the number 42 so that its product is minimized. - Compare three fractions
Which of the three rational numbers is the largest? 1/7, 6/17, 4/17 - Divisors of 560
Which of the numbers 5, 6, 7, 14, and 15 are divisors of 560? Please justify the answer. - Decomposition
Make decomposition using prime numbers of number 155. The result write as prime factors (all, even multiple) - Consecutive 23251
Find the LCM of four consecutive natural numbers. Its sum is 42. - HCF - big numbers
Find the HCF of 72030 and 88200 - Simple form
Given ratio 45: 90 = Write the ratio in a Simple form - Divisible by nine
How many three-digit natural numbers in total are divisible without a remainder by the number 9? - Counting number
What is the smallest counting number divisible by 2,5,7,8 and 15? - Four-digit number
Find a four-digit number, which quadrupled written backward is the same number. - Number 80500
Which number does not belong in the number series and why? 11. . . 13 . . . 15 . . . 17 . . . 19 - Difference 56811
I think the number. The difference between nine times and four times the unknown number is 625. What number do I think? - Three-fifths 34771
Calculate three-fifths of the ratio of the product and the sum of all prime divisors of 240. - LCMs
What is the difference between the LCM (16, 400) and LCM (15, 65)? - Prime divisors
Find 2/3 of the sum's ratio and the product of all prime divisors of the number 120. - Two-digit number
I am a two-digit number less than 20. When I divide by three, you get the rest 1. When you divide me by four, you also get the rest 1. What number am I? - Twenty-five
How many are three-digit natural numbers divisible by 25? - Determine 2757
The sum of all divisors of a certain odd number is 78. Determine the sum of all divisors of twice this unknown number. What is an unknown number? - 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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