Or... you could get 54. If the first number is A and the second number is B, Take the number of letters in the name of A times the number of letters in the name of B:
one * two = 3*3 = 9 three * four = 5 * 4 = 20 five * six = 4 * 3 = 12 seventeen * twelve = 9 * 6 = 54
Simpler Pattern
