Numerical Ability - Simplification & Approximation
Approximate: 789 × 63 (round to nearest hundred)
Approximate: 789 × 63 (round to nearest hundred)
medium Q15 of 15
Step-by-Step Solution
Step 1: Compute exact product
789 × 63 = 789 × (60 + 3) = 789×60 + 789×3 = 47,340 + 2,367 = 49,707.Step 2: Round to the requested precision
Round 49,707 to the nearest hundred → 49,700.Final Answer:
49,700 → Option B.Quick Check:
49,707 is 7 above 49,700 and 293 below 50,000, so 49,700 is the nearest hundred ✅
Quick Trick: If unsure, compute exact product using distributive property (×(a+b)) then round; it's more reliable than ad-hoc double rounding.
Common Mistakes:
- Rounding both factors inconsistently (one up, one down) which can produce a large bias; ignoring exact product when available.
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