Evaluate (0.14 x 0.275)/(7 x 5.5) correct to 3 significant figures

JAMB Mathematics 2023 55 views

Evaluate (0.14 × 0.275)/(7 × 5.5) correct to 3 significant figures

  1. 0.001
  2. 0.0010
  3. 1.00 × 10⁻³ ✓
  4. 1.0 × 10⁻³

Explanation

Step 1: Calculate numerator
0.14 × 0.275 = 0.0385

Step 2: Calculate denominator
7 × 5.5 = 38.5

Step 3: Divide
0.0385 ÷ 38.5 = 0.001

Step 4: Express in scientific notation
0.001 = 1.00 × 10⁻³

Step 5: Check significant figures
1.00 × 10⁻³ shows 3 significant figures (1, 0, 0)
1.0 × 10⁻³ shows only 2 significant figures
Question requires 3, so answer is 1.00 × 10⁻³

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