80 has 5 factor pairs.
Five
A whole number that is a factor of two or more numbers is a common factor.
a common factor
A common factor.
a factor
Yes.
Prime numbers have one factor pair. Composite numbers have two or more pairs. (6,8) and (4,12) are two different factor pairs for 48.
Any number is a factor and a multiple of itself. Other factors are less than the number, other multiples are more. 5 is a factor of 10. 10 is a multiple of 5.
Five
30
Twenty only has three factor pairs. (20,1)(10,2)(5,4)
Apart from [1,201], [3,67] is the only other factor pair. Since both 3 and 67 are prime numbers, you know you won't be able to find any more factor pairs.
All composite numbers can be expressed as unique products of prime numbers. This is accomplished by dividing the original number and its factors by prime numbers until all the factors are prime. A factor tree can help you visualize this. Example: 210 210 Divide by two. 105,2 Divide by three. 35,3,2 Divide by five. 7,5,3,2 Stop. All the factors are prime. 2 x 3 x 5 x 7 = 210 That's the prime factorization of 210.
A number that is a factor of two or more numbers is simply a common factor
A whole number that is a factor of two or more numbers is a common factor.
a positive number is more, not less.
A number with more than one factor is normal, since all numbers except 0 and 1 have more than one factor. A number with more than two factors is composite.