(20,1)(10,2)(5,4)
The difference is between factor pairs and distinct factors. With square numbers, one of the factor pairs will be the same number twice. When listing the distinct factors, that number is only listed once.
(63,1)(21,3)(9,7)
(20,1)(10,2)(5,4) (30,1)(15,2)(10,3)(6,5) (36,1)(18,2)(12,3)(9,4)(6,6)
It's not, because all the factors of 20 aren't prime.
1 and 20, 2 and 10, 4 and 5 are all of the pairs of factors of 20.
3 pairs
How they're listed. The factors of 20 are 1, 2, 4, 5, 10, 20 The factor pairs of 20 are (20,1)(10,2)(5,4)
Factor pairs are just the factors of a number listed in a different way. The factors of 20 are 1, 2, 4, 5, 10, 20 The factor pairs of 20 are (20,1)(10,2)(5,4)
3 pairs of factors. They are: 1 and 20 2 and 10 4 and 5 Pairs of factors are numbers that you multiply together to make that number, e.g. 4x5=20. Trust me I'm a teacher!
The factors pairs of 20 are 1x20, 2x10, and 4x5 so 20 has 6 factors and 5 proper factors.
(20,1)(10,2)(5,4)
The difference is between factor pairs and distinct factors. With square numbers, one of the factor pairs will be the same number twice. When listing the distinct factors, that number is only listed once.
The factor pairs of 20 are: 20,1 / 10,2 / 5,4
Twenty only has three factor pairs. (20,1)(10,2)(5,4)
21,1 and 7,3
The factor pairs for 20 are: 1 x 20 2 x 10 4 x 5