BECE Mathematics 2020 Paper

Concept:Adding decimals requires equal decimal places so that place values are aligned.Explanation:The given numbers are $2.4$, $0.042$, $1.12$ and $0.342$. The number with the most digits after the decimal point is $0.042$, which has $3$ decimal places. Convert all numbers to $3$ decimal places by adding trailing zeros: $2.4 \rightarrow 2.400$ and $1.12 \rightarrow 1.120$. Now add them together: $2.400 + 0.042 + 1.120 + 0.342$. Add the decimal parts: $0.400 + 0.042 + 0.120 + 0.342 = 0.904$. Add the whole-number parts: $2 + 0 + 1 + 0 = 3$. Hence the total is $3.904$. This matches Option B.Answer:$\boxed{3.904}$ (Option B)