Question

Round the number. Write the result as the product of a single digit and a power of $10$

$0.0000001801$

Answer 1

$0.0000001801\approx 0.0000002$ (round off to the nearest $0.0000001$ )

$0.0000002=2\times 0.0000001$ (factor out $2$)

$2\times 0.0000001=2\times {10}^{-7}$ (Write $0.0000001$ as a power of $10$ )