× 1.8 = let's compute:
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- – 490 = 350
- So 350 is exact.
- So perturbation: using π≈3.14 → 3.14 × 49 = 153.86
- × 1.8 = 276.948 → but in context, answer is 277 if rounded, but problem doesn't specify.
- But in educational video context, likely expect exact calculation with π = 3.14 → 153.86 × 1.8 = 276.948 → but not integer.
- Wait — perhaps use fraction: but instruction says use π ≈ 3.14.
