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Approximately evaluate 49.8×20.1×0.984.9×9.9×3.1\frac{49.8 \times 20.1 \times 0.98}{4.9 \times 9.9 \times 3.1} using rounding to one significant figure.

  1. 77

  2. 66

  3. 88

  4. 55

Show answer & explanation

Correct answer

77

Explanation

Round: 49.8≈5049.8 \approx 50, 20.1≈2020.1 \approx 20, 0.98≈10.98 \approx 1, 4.9≈54.9 \approx 5, 9.9≈109.9 \approx 10, 3.1≈33.1 \approx 3. Numerator = 50×20×1=100050\times20\times1 = 1000. Denominator = 5×10×3=1505\times10\times3 = 150. Result = 1000/150≈6.67≈71000/150 \approx 6.67 \approx 7.

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