BECE Mathematics 2019 Paper

Concept:Significant figures count only digits that carry meaning; leading zeros after a decimal point are not significant.Explanation:In $0.024561$, the leading zeros ($0.0$) are not significant.So, the significant digits begin at $2$: $2,4,5,6,1$.To round to three significant figures, keep the first three digits: $2,4,5$.Look at the next digit, which is $6$.Since $6 \geq 5$, we round the third digit $5$ up to $6$.Thus, $0.024561$ becomes $0.0246$.Answer:$0.0246$, which is option D.