Question

$3\times 0.3\times 0.03\times 0.003\times 30=x.$ Find $x.$

• A. $0.0000243$
• B. $0.000243$
• C. $0.00243$
• D. $0.0243$

Answer 1

The correct option is C $0.00243$

$3\times 3\times 3\times 3\times 30=2430$
$\therefore x=3\times 0.3\times 0.03\times 0.003\times 30$
$=0.002430=0.00243$
(Number of decimal places $=1+2+3=6$)