Discussion
Jay’s room has a floor of 8m by 4m. He decides to tile the floor with tiles of 25cm x 20 cm. How many tiles will he need?
Answer: B
Work in a single unit - centimetres - before dividing.
\[ \text{floor} = 800 \times 400 = 320{,}000 \text{ cm}^{2} \]
\[ \text{tile} = 25 \times 20 = 500 \text{ cm}^{2} \]
\[ n = \frac{320{,}000}{500} = 640 \]
Dividing the floor in square metres (32) by the tile in square centimetres (500) is the classic slip and produces the nonsensical 6.4 offered as the last option.
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