Jambmaths question:
Evaluate $\tfrac{21}{9}$to 3 significant figures
Option A:
2.30
Option B:
2.31
Option C:
2.32
Option D:
2.33
Jamb Maths Solution:
$\begin{align} & 9\overset{\text{ }2.33}{\overline{\left){\begin{align} & 21\text{ } \\ & \underline{18} \\\end{align}}\right.}} \\ & \text{ }30 \\ & \text{ }\underline{27} \\ & \text{ }30 \\ & \text{ }\underline{\text{27}} \\ & \text{ }3 \\ & \therefore \frac{21}{9}\approx 2.33\text{ (3s}\text{.f)} \\\end{align}$
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