The GCF is 7.
The GCF is 7.
There can only be one "highest".Here's how to find it:Factors of 35: 1, 5, 7, and 35Factors of 45: 1, 3, 5, 9, 15, and 45Common factors: 1 and 5Highest common factor ===> 5
20 and 40 have 4 and 5 as common factors.
27 and 28 have no common factors other than one. Any pair of consecutive integers is coprime, and such a pair's only common factor is 1.
The common factor is 1.
21 and 42
1 and 2
12 and 24
12 and 24
All numbers have common multiples.
It is common to group factors in pairs with parentheses surrounding each pair.
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.