Step by step
- Write each number as a fraction4 = 4/1
- Keep, change, flipKeep the first fraction, change ÷ to ×, and flip the second fraction upside down:2/5 ÷ 4/1 = 2/5 × 1/4
- Multiply the tops, then the bottoms(2 × 1)/(5 × 4) = 2/20
- SimplifyDivide the top and bottom by 2: 2/20 = 1/10
Check: 1/10 × 4 = 2/5 ✓