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Find the GCF and LCM of two whole numbers

## What are the factors of 18?

Here are all the factors of 18: 1; 2; 3; 6; 9; 18.
18 has more than two factors because 18 is not a prime number, it is a composite number. A composite number is an integer that is obtained by multiplying at least 2 prime numbers, we can say a composite number is a multiple of prime numbers.
18 has six factors, the factors of 18 are also called divisors of 18, when 18 is divided by one of its factors, the division gives integer quotient and zero remainder.
The prime factors of 18 are: 2 and 3
The prime factorization of 18 is: 2*3*3=2*3^2
If 18 is a factor of a positive integer then that positive integer is a multiple of 18, we can divide it by 18 to get an integer quotient and a remainder equal to zero, we can also multiply 18 by another natural number for obtaining the multiple of 18.
Example: 3 multiplied by 6 is equal to 18, then 3 and 6 are factors of 18. 18 is a commun multiple of 3 and 6. By dividing 18 by 6 we get 3. That means if we make the division of 18 by one of its factors, the quotient must be another factor of 18.
There are 3 pairs of factors of 18 whose multiplication makes it possible to find 18: 1 and 18 (1*18=18); 2 and 9 (2*9=18); 3 and 6 (3*6=18).
Here are all the factors of some integers (composite numbers from 242 to 260):

### The factors of 242:

1; 2; 11; 22; 121; 242

### The factors of 244:

1; 2; 4; 61; 122; 244

### The factors of 245:

1; 5; 7; 35; 49; 245

### The factors of 246:

1; 2; 3; 6; 41; 82; 123; 246

### The factors of 248:

1; 2; 4; 8; 31; 62; 124; 248

1; 3; 83; 249

### The factors of 250:

1; 2; 5; 10; 25; 50; 125; 250

### The factors of 252:

1; 2; 3; 4; 6; 7; 9; 12; 14; 18; 21; 28; 36; 42; 63; 84; 126; 252

1; 2; 127; 254

### The factors of 255:

1; 3; 5; 15; 17; 51; 85; 255

### The factors of 256:

1; 2; 4; 8; 16; 32; 64; 128; 256

### The factors of 258:

1; 2; 3; 6; 43; 86; 129; 258

### The factors of 260:

1; 2; 4; 5; 10; 13; 20; 26; 52; 65; 130; 260

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