Mock Set 1 Paper 02 Calculator

\[ \begin{array}{l} \text{Sofia is trying to find the area of this rectangle.} \\ \\ \text{She writes,} \\ \\ \quad \text{``The area is 441 cm$^2$ because $7 \times 3 \times 7 \times 3 = 441$''} \end{array} \]

(a) \begin{array}{l} \text{Explain what is wrong with Sofia’s method.} \end{array}\\[3cm] (1 mark)

(b) \begin{array}{l} \text{Alex works out the area of a shape. His answer is 42 cm.} \\ \text{Explain why his answer cannot be fully correct.} \end{array}\\[3cm] (1 mark)