It is: 3*7 = 21
As a product of its prime factors: 3*3*7*7 = 441 Its square root is 21 or as 3*7 as the product of its prime factors
An HCF is the product of any common prime factors of two numbers. If two numbers have no common prime factors, then the HCF will be 1. For example, 10 and 21. The prime factors are 2x5 and 3x7. There is nothing in common, and so the HCF of 10 and 21 is 1. Two consecutive numbers will always have the HCF of 1.
The factors of 21 are 1, 3, 7, and 21 which means that 21 is composite.
40 and 21 have no common prime factors
It is simply: 3 times 7 = 21
21 as a product of its prime factors is 1 X 3 X 7.
It is 3 time 7 = 21
It is: 3*7 = 21
As a product of its prime factors: 3*3*7*7 = 441 Its square root is 21 or as 3*7 as the product of its prime factors
It is when the prime factors of whole number are multiplied together that they equal that number. For example the prime factors of 21 are 3 and 7 so 3*7 = 21
2²×3×5
The factors of 21 are: 1 3 7 21 The prime factors are: 3 and 7
1, 3, 7, 21 3 and 7 are prime.
factors of 21: 3, 7 prime factors of 21: 3, 7
The factors are 1, 3, 7 and 21. 3 and 7 are prime.
18 has prime factors 3 & 2 whereas 21 has prime factors 3 & 7.