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Give all the common prime factors each pair of numbers share?
Okay. Give us a pair of numbers.
How are parentheses used in grouping factors?
It is common to group factors in pairs with parentheses surrounding each pair.
What pair of numbers is 30 and 18 a common prime factor?
The common prime factors of 18 and 30 are 2 and 3.
Are there any 2 numbers that don't have a common factor?
Since 1, known as the "multiplicative identity", cannot be counted as a factor, there are many pairs of numbers that do not have common factors, such as 2 and 3, 2 and 5, and 3 and 5. There are many pairs of composite (not prime) numbers without common factors, such as 4 and 9. Also, since prime numbers do not have factors, any pair of primes cannot have a common factor, though a pair in which one number is prime may, e.g. 5 and 10.
What number is the greatest common factor of a number over 50?
A single number does not have a common factor. Common factors are factors that two or more numbers have in common. The greatest common factor of a pair of numbers over 50 could be any number, depending on the pair of numbers. The greatest common factor of 51 and 100 is 1. The greatest common factor of 51, 52, 53, 54, 55, and 56 is 1. The greatest common factor of 52 and 100 is 2. The greatest common factor of 57 and 102 is 3.
What are the common factors for each pair of numbers 11 and 15?
The common factor is 1.
Give all the common prime factors each pair of numbers share?
Okay. Give us a pair of numbers.
Common factors for each pair of numbers 9 and 25?
Just 1.
What are the common factors of each pair of numbers 28 and 40?
1, 2 and 4
What pair of numbers do not have any common multiples?
All numbers have common multiples.
If two is not a common factor of a pair of numbers what other numbers cannot be common factors?
Even numbers.
What pair of numbers is relatively prime 10 and 21 12 and 54 15 and 27 21 and 39?
I suggest factoring each pair of numbers, and checking whether they have, or don't have, common factors. A pair of numbers is said to be "relatively prime" if they have no common factors (their greatest common factor is 1). For larger numbers, Euclid's algorithm could be used, but for such small numbers, factoring is probably faster.
Can a pair of numbers have fewer than two common factors?
Yes, a pair of numbers can have fewer than two common factors. This only happens when the numbers are co-prime -- that is, when the numbers have only one common factor. In that case, the common factor is always 1.
What pair of numbers have 4 and 5 as common factors?
20 and 40 have 4 and 5 as common factors.
Which pair of numbers has 3 and 7 as common factors?
21 and 42
What pair of numbers have 4 and 6 as common factors?
12 and 24
Which pair of numbers have 4 and 6 for the common factors?
12 and 24
