The GCF is the first number.
If the second number is a multiple of the first number, then the greatest common factor (GCF) would be the first number itself. This is because the GCF is the largest number that divides both numbers evenly, and since the second number is a multiple of the first number, the first number would be the largest common factor. So, the GCF in this case would be the first number.
That is correct. The other number is the LCM.
When the first number is a factor of the other, the first number is the GCF.
Find the GCF of the two numbers. If the GCF is 1, the numbers are relatively prime. or Look at the prime factorization of the first number. Choose a second number that doesn't have any prime factors in common with the first.
If the prime factors of the first whole number are all different from the prime factors of the second whole number, then the GCF is 1.
You need at least two numbers to find a GCF.
The GCF is x2
Do the coefficients first. Since 5 is a factor of 15, it is automatically the GCF. Choose the lowest power of the common variables. The GCF is 5b.
Various methods:Express both the numbers as their prime factorisations in power format. The gcf is the product of the lowest powers of the common primes:18 = 2 x 32 20 = 22 x 5Common prime(s): 2Lowest power is in 18 where it is 21 (=2)So gcf = 2.Euclid's method:Find the remainder of dividing the first number by the secondif the remainder is zero, the gcf is the second number.Repeat from step 1 with the second number as the first number and the remainder as the second number.So for 18 & 20: 18 ÷ 20 = [0] remainder 1820 ÷ 18 = [1] remainder 218 ÷ 2 = [9] remainder 0So gcf is 2.
Do the coefficients first. Since 5 is a factor of 15, it is automatically the GCF. Choose the lowest power of the common variables. The GCF is 5a.
The GCF of 2 numbers can be less than either number.