Step by step
- Write each number as a fraction1 = 1/1
- Find a common denominatorThe lowest common denominator of 3 and 1 is 3.2/3 = (2 × 1)/(3 × 1) = 2/31/1 = (1 × 3)/(1 × 3) = 3/3
- Subtract the numerators (tops)2/3 − 3/3 = -1/3
Check: -1/3 + 1 = 2/3 ✓