First you need to convert 1 1/3 into an improper fraction by multiplying 1 by 3, and then adding 1 to get 4/3. 13 can be written a 13/1, and the rule for fractions is to multiply across, so you get 13/1 × 4/3, which equals 52/3. This can't be simplified down, but it can be rewritten as a mixed number of 17 1/3. I hope this helps!
