Question

The order of magnitude of $499$ is $2$, then the order of magnitude of $501$ will be

• A. $4$
• B. $2$
• C. $1$
• D. $3$

Answer 1

The correct option is D $3$

Order of magnitude of $499$ is $2$ as

$\frac{499}{{10}^2}=4.99<5$ i.e. $499\approx {10}^2$

Order of magnitude of $501$ is

$\frac{501}{{10}^3}=0.501>0.5$ i.e. $501\approx {10}^3$

Order of magnitude $=3$.