Q: Estimate 4,891 × 203 and round 3.746 to 2 decimal places. Step 1: Estimate: 4,891 ≈ 5,000; 203 ≈ 200. Step 2: 5,000 × 200 = 1,000,000 (actual: 992,873 — close!). Step 3: Round 3.746 to 2 d.p.: look at third decimal (6 ≥ 5) → 3.75.