Question 4

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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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