Question

The area of a rectangular field (in ${\text{m}}^2$ ) of length $55.3\text{m}$ and breadth $25\text{m}$ after rounding off the value for correct significant digits is

• A. $1382.5$
• B. $14\times {10}^2$
• C. $1382$
• D. $138\times {10}^1$

Answer 1

The correct option is B $14\times {10}^2$

Area of rectangle $=l\times b$

$=55.3\times 25=1382.5{\text{m}}^2$

Now $l$ has $3$ significant figures

$b$ has $2$ significant figures

In multiplication answer must have minimum significant figure.
So, answer must be $14\times {10}^2{\text{m}}^2$
Hence, the correct option is $\text{(}b)$.