Step by step
- Write each number as a fraction1 = 1/1
- Find a common denominatorThe lowest common denominator of 1 and 3 is 3.1/1 = (1 × 3)/(1 × 3) = 3/31/3 = (1 × 1)/(3 × 1) = 1/3
- Subtract the numerators (tops)3/3 − 1/3 = 2/3
Check: 2/3 + 1/3 = 1 ✓