The greatest common factor between the two numbers is 20, because both numbers are divisible by 20. It cannot be any higher because 20 is one of the numbers itself. You divide this out of both numbers and put it outside the function with the use of parenthesis.
$19.00 plus $2.50 = $21.50. $14.00 plus $3.75 = $17.75 add $3.75 to $17.75 once to get 21.50 2 hours at Woof Watchers is the same as 1 hour at Happy Paws. <Hope that helped>
