JAMB 2013 Mathematics · Question 15
Evaluate , correct to 1 decimal place
Options
- A.0.6
- B.6.2
- C.6.3
- D.0.5
Answer: A. 0.6
Explanation written with AI and checked against the answer key
Analyze the question: We need to compute (1.25 × 0.025) ÷ 0.05 and round to 1 decimal place. Concept: Multiply the numbers in the numerator first, then divide. Removing decimals by scaling can make the division easier. Solution: Step 1: Multiply the numerator. 1.25 × 0.025 = 0.03125 (Check: 125 × 25 = 3125, and there are 2 + 3 = 5 decimal places, so 0.03125.) Step 2: Divide by 0.05. 0.03125 ÷ 0.05 = 3.125 ÷ 5 = 0.625 Step 3: Round to 1 decimal place. 0.625 → 0.6 (the second decimal digit is 2, which is less than 5, so we round down). Wait, let me double check the digit: 0.625 has digits 6, 2, 5. The first decimal place is 6, and the next digit is 2, so it stays 0.6. Answer: 0.6, which is option A. Why the other options are wrong: B (6.2) and C (6.3) come from misplacing the decimal point by one place (6.25 would round to 6.3 or 6.2). D (0.5) would come from rounding 0.625 incorrectly. Exam tip: To avoid decimal-point errors, estimate first: 1.25 × 0.025 is about 0.03, and 0.03 ÷ 0.05 = 0.6. This quick check confirms the answer is near 0.6, not 6.AI can make mistakes. Report anything that looks wrong.
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