By rounding each number to 1 significant figure, estimate the value of $\dfrac{1988 \times 6.32}{342.5 - 142.5}$. Show your working clearly. Answer ...

1. Round each given number to 1 significant figure.

$1988 \approx 2000$,

$6.32 \approx 6$,

$342.5 \approx 300$,

$142.5 \approx 100$

2. Substitute the rounded values and calculate the estimate.

$\frac{1988 \times 6.32}{342.5 - 142.5} \approx \frac{2000 \times 6}{300 - 100}$

$= \frac{12000}{200} = 60$