1. n) 1 1/4 - 5/3

1. Convert mixed number to improper fraction: 1 1/4 = 5/4.
2. Find a common denominator for 4 and 3, which is 12. Convert fractions: 5/4 = 15/12, 5/3 = 20/12.
3. Subtract the fractions: 15/12 - 20/12 = -5/12.