30 x 6 = 180
Anything you like. Since the predicate "if 29*16 = 290" is false, anything goes!
Well, Garth needs to multiply the ones digit of 29 by the ones digit of 16 to get 174, which is correct. Then, he needs to multiply the tens digit of 29 by the ones digit of 16 to get 290, which is also correct. To find the final product, Garth should add these two results together, giving him a total of 464. Easy peasy lemon squeezy!