1.2k+2.4

Factor out the coefficient of the variable and find the greatest common factor

Factor out the coefficient of the variable means use how any k's there are, as k is our variable. this is 1.2

the greatest common factor of 1.2 and 2.4 can be found easier by multiplying both by 10

= 12 and 24

then find the factors of these two numbers:

12 = 1, 2, 3, 4, 6, 12

24 = 1, 2, 3, 4, 6, 8, 12, 24

the common factors are:

1, 2, 3, 4, 6 and 12

the greatest of these factors is 12, and therefore the greatest common factor.

divide this answer by 10, as we multiplied it earlier.

so the greatest common factor of 1.2 and 2.4 is 1.2