Question

The HCF of 1.08, 0.36 and 0.9 is

• A. 0.03
• B. 0.9
• C. 0.18
• D. 0.108

Answer 1

The correct option is C 0.18

Converting them to like decimals we have
1.08, 0.36 and 0.90
Treating them as whole numbers the numbers
are 108, 36 and 90
108 = $2^2\times 3^3,36=2^2\times 3^2,90=2\times 3^2\times 5$

$\therefore$ HCF of $108,36,90=2$ x $3^2=18$

$\Rightarrow$ HCF of $1.08,0.36,0.90=0.18$

($\therefore$ All of them have two places of decimal)