Numerical Ability - Simplification & Approximation
Simplify: (3.6 × 2.5) − 4.8
Simplify: (3.6 × 2.5) − 4.8
medium Q15 of 15
Step-by-Step Solution
Step 1: Multiply by converting to integers
Multiply first: remove decimals → 36 × 25 = 900.Step 2: Restore decimal places
Total decimal places = 2 → 900 → 9.00. So 3.6 × 2.5 = 9.00.Step 3: Subtract
Now subtract: 9.00 − 4.80 = 4.20 → 4.2.Final Answer:
4.2 → Option A.Quick Check:
3.6 × 2.5 ≈ 9; 9 − 4.8 = 4.2 ✅
Quick Trick: Do multiplication first (convert to integers), then subtraction; keep decimal places aligned.
Common Mistakes:
- Subtracting before multiplying or misplacing decimal after multiplication.
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