JAMB Mathematics 2015 Paper

Concept:When multiplying decimals, first ignore the decimal points, multiply as whole numbers, then place the decimal point in the final product.Explanation:First, multiply $204$ by $37$ without considering the decimals.$204 \times 37 = 7548$.Now, count the total decimal places in the original factors.$2.04$ has $2$ decimal places, and $3.7$ has $1$ decimal place.Total decimal places = $3$.So, place the decimal point three digits from the right: $7.548$.To round to $2$ decimal places, look at the third decimal digit, which is $8$.Since $8 \geq 5$, we round the second decimal place up: $7.548 \rightarrow 7.55$.Answer:The correct answer is $7.55$, which matches option D.